A group of first-graders at Mitchell-Neilson Primary School in Murfreesboro, Tenn. had their recess cut short this week when their teacher found remnants of a mobile meth lab on the playground.

Shortly after the lunch hour Tuesday, the teacher noticed a bag with a plastic bottle and tube lying on the ground. Not knowing what the contraption was, she ushered the students back into the school and brought the items to the assistant principal's office.

The school officer, who also happens to be a part of the local Methamphetamine task force, recognized the materials as a part of a "shake and bake meth lab," Murfreesboro Police Sgt. Kyle Evans told the Daily News Journal. The Tennessee Meth Task Force was called in to remove the lab and authorities are now searching for the person responsible.

"Meth labs are scary enough, but the fact that someone would bring one on a school campus is a dangerous situation," Evans told WSMV.

Murfressboro City Schools spokesperson Lisa Trail notes that no students were exposed and all are safe. No drugs were found inside the bottle.

The fire department has decontaminated the playground and assistant principal's office with soap and water, The Tennesseean reports. School parents have also been notified of the incident.

The school's maintenance staff uses rock salt on the playground to tame weeds and grass. That very rock salt is an ingredient used to make meth, pointing to a likelihood that the perpetrator sought to use the salt from the playground to make drugs, Evans tells WSMV.

Parents are still worried that children may have been exposed before the items were found on the playground, but officials say that students are only at risk if they came in direct or very close contact with the substance. Trail says school officials believe the incident is isolated.

"To the best of my knowledge, this is the first time we've had anything like this happen on one of our campuses," Trail told the station. "We hope it's the last time, but this is a learning experience."

Meth is federally classified as a "Schedule II drug" and is only legally available through a non-refillable prescription. The drug increases the release of dopamine leading to a euphoric sensation. Even small amounts of meth can lead to side effects like irregular heartbeat, increased blood pressure and hyperthermia.

Schedule II drugs are controlled substances that have high potential for abuse, has an accepted medical in the U.S., potentially with restrictions, and abuse of the drug could lead to severe dependence.

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  • Kindergarten Kekec by Arhitektura Jure Kotnik -- Ljubljana, Slovenia

    An extension of a typical Slovenian prefab kindergarten from the '80s, the colorful, interactive design is a response to the school's lack of play equipment. The addition's three exterior walls are made of "toy slats": natural wooden planks that the kids can play with to "get to know different colors, experience wood as a natural material and constantly change the appearance of their kindergarten, all at the same time." via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Miran Kambič via <a href="http://housevariety.blogspot.com/2011/03/kindergarten-kekec-by-arhitektura-jure.html#.UDHC1dDl3nQ">House Variety</a>

  • Kindergarten Kekec by Arhitektura Jure Kotnik -- Ljubljana, Slovenia

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Miran Kambič via <a href="http://housevariety.blogspot.com/2011/03/kindergarten-kekec-by-arhitektura-jure.html#.UDHC1dDl3nQ">House Variety</a>

  • Bailly School Complex by Mikou Design Studio -- Saint-Denis, France

    A catalyst for the development of an up-and-coming community, the bold learning complex houses a pre-school, an elementary school, and a rec center. Circulation is through a series of interior courtyards, allowing children to get fresh air between classes and to have a pleasant -- albeit brief -- experience of the outdoors during an otherwise enclosed school day. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Florian Kleinfenn via<a href="http://www.german-architects.com/en/projects/35702_bailly_school_complex/all/featured"> german-architects </a>

  • Bailly School Complex by Mikou Design Studio -- Saint-Denis, France

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Florian Kleinfenn via<a href="http://www.german-architects.com/en/projects/35702_bailly_school_complex/all/featured"> german-architects </a>

  • Crèche Rue Pierre Budin by ECDM -- Paris, France

    Built around an expansive courtyard, this whimsical day-nursery sits in an eclectic Parisian neighborhood next to an intrusive 12-story building. Keeping the size of its Lilliputian inhabitants in mind, the scale of the project is intentionally small, and the design focuses on protection, both from the encroaching building next door and the city in general. The French architects described this elegant, cheerful school by stating that "the goal is to propose for this tiny program a frame of living that generates as much an emotion with the future occupants (children, parents, staff) than the local residents." A win-win situation for the kids and the community. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Luc Boegly via<a href="http://www.dezeen.com/2012/06/28/creche-rue-pierre-budin-by-ecdm/"> dezeen </a>

  • Crèche Rue Pierre Budin by ECDM -- Paris, France

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Luc Boegly via<a href="http://www.dezeen.com/2012/06/28/creche-rue-pierre-budin-by-ecdm/"> dezeen </a>

  • Galjoen School by Rocha Tombal -- The Hague, The Netherlands

    This red brick primary school is intended to wind around the site like a giant, motherly crocodile. Tapping into ideas about security and adventure, the designers explain that "with its friendly face and an attractive identity, this 'colorful animal' will improve the atmosphere of the square." Playing off of a pre-existing industrial power station, the two buildings form a protected outdoor play space complete with a garden. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Christian Richters via<a href="http://www.dezeen.com/2012/06/28/creche-rue-pierre-budin-by-ecdm/"> dezeen </a>

  • Galjoen School by Rocha Tombal -- The Hague, The Netherlands

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Christian Richters via<a href="http://www.dezeen.com/2012/06/28/creche-rue-pierre-budin-by-ecdm/"> dezeen </a>

  • Timayui Kindergarten by Giancarlo Mazzanti -- Santa Marta, Colombia

    The Timayui preschool is made up of flexible modules surrounding a courtyard like the petals of a flower, creating playgrounds, outdoor classrooms, gardens, and orchards. Not only does the school provide a healthy, inspiring environment for the children, but it also strives to ameliorate the surrounding impoverished community. Hoping to lead by example, the innovative, open-source project was designed to be easily replicated. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: <a href="http://www.hicarquitectura.com/2011/06/giancarlo-mazzanti-escuela-rural-en.html"> HIC* </a>

  • Timayui Kindergarten by Giancarlo Mazzanti -- Santa Marta, Colombia

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: <a href="http://www.hicarquitectura.com/2011/06/giancarlo-mazzanti-escuela-rural-en.html"> HIC* </a>

  • Leimondo Nursery School by Archivision Hirotani Studio -- Nagahama, Japan

    The focal point of this Japanese nursery school is what the architects are calling a House of Light, conical light-wells "of different shapes, different colors and facing different directions, changing with the time and the seasons." The kids are invited to notice the change in light during the year and to play and chase the lights as they move across the walls of the room. Poetic and brilliant. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: <a href="http://www.architizer.com/en_us/projects/view/the-leimondo-nursery-school/28040/"> Architizer </a>

  • Leimondo Nursery School by Archivision Hirotani Studio -- Nagahama, Japan

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: <a href="http://www.architizer.com/en_us/projects/view/the-leimondo-nursery-school/28040/"> Architizer </a>

  • The Josephine Baker Schools by Dominique Coulon & Associés -- La Courneuve, France

    <a href="http://www.coulon-architecte.fr/">Dominique Coulon & Associés</a> have given a lot of thought to the needs of a child, and the difference between children and adults. According to Coulon, "it isn't just another school which has been designed as an area for adults in a micro scale serving children." The designers really wanted to emphasize the relationship between a child's small frame and the space. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Eugeni Pons via <a href="http://yatzer.com/The-Josephine-Baker-School-in-La-Courneuve"> Yatzer </a>; Olivier Nicollas via <a href="http://yatzer.com/The-Josephine-Baker-School-in-La-Courneuve"> Yatzer </a>

  • The Josephine Baker Schools by Dominique Coulon & Associés -- La Courneuve, France

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Eugeni Pons via <a href="http://yatzer.com/The-Josephine-Baker-School-in-La-Courneuve"> Yatzer </a>; Olivier Nicollas via <a href="http://yatzer.com/The-Josephine-Baker-School-in-La-Courneuve"> Yatzer </a>

  • Antas Education Centre by AVA Architects -- Porto, Portugal

    The striking simplicity of this project stands out and reminds us of a quote by the great American columnist <a href="http://en.wikipedia.org/wiki/William_E._Vaughan">Billy Vaughn</a>, famous for his folksy aphorisms: "A three-year-old child is a being who gets almost as much fun out of a 56-dollar set of swings as it does out of finding a small green worm." Surely a child would find great pleasure and inspiration in this blank green canvas of a space. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: José Campos via <a href="http://www.arthitectural.com/ava-architects-antas-educative-center/antas-education-center-1/"> Architectural </a>

  • Antas Education Centre by AVA Architects -- Porto, Portugal

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: José Campos via <a href="http://www.arthitectural.com/ava-architects-antas-educative-center/antas-education-center-1/"> Architectural </a>

  • Sarreguemines Nursery by Michel Grasso and Paul Le Quernec -- Sarreguemines, France

    We have to give this project points for commendable creativity. Designed as a body cell, the nursery sits at the center as the "nucleus." Cytoplasm is represented by the surrounding gardens, and the exterior wall is akin to the membrane. The pre-K kids might be too young to fully appreciate the reference, but if a little cellular biology seeps in by osmosis, then we give the architects a giant gold star. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Michel Grasso + Paul Le Quernec via <a href="http://www.archdaily.com/178954/sarreguemines-nursery-michel-grasso/"> archdaily </a>

  • Sarreguemines Nursery by Michel Grasso and Paul Le Quernec -- Sarreguemines, France

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Michel Grasso + Paul Le Quernec via <a href="http://www.archdaily.com/178954/sarreguemines-nursery-michel-grasso/"> archdaily </a>

  • Rafael Arozarena High School by AMP Arquitectos -- La Orotava, Spain

    Way to teach the young ones about the importance of context! Integrating the pre-existing walls of the farming terraces, this bold and beautiful high school blends seamlessly with the agrarian landscape, but still maintains a decidedly modern design. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: AMP Arquitectos via <a href="http://www.worldarchitecturenews.com/index.php?fuseaction=wanappln.projectview&upload_id=11025"> World Architecture News </a>

  • Rafael Arozarena High School by AMP Arquitectos -- La Orotava, Spain

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: AMP Arquitectos via <a href="http://www.worldarchitecturenews.com/index.php?fuseaction=wanappln.projectview&upload_id=11025"> World Architecture News </a>

  • Ørestad Gymnasium by 3XN Architects -- Copenhagen, Denmark

    This Danish equivalent of a high school is definitely where we most wish we'd spent our formative teen years. The progressive, media-oriented design was inspired by a philosophy that favors "open study environments" instead of traditional classrooms. Sprawling on a giant beanbag in a floating circular loft space while debating the future of Square in the world of retail? Yes, please. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: <a href="http://archisdesign.com/superstructure-orestad-gymnasium-designed-by-3xn/superstructure-orestad-gymnasium-designed-by-3xn_1"> archisdesign </a>; Adam Mørk via <a href="http://www.dac.dk/en/service-sider/press/press-archive/2010/close-up-3xn-mind-your-behaviour/">Danish Architecture Centre</a>

  • Ørestad Gymnasium by 3XN Architects -- Copenhagen, Denmark

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: <a href="http://archisdesign.com/superstructure-orestad-gymnasium-designed-by-3xn/superstructure-orestad-gymnasium-designed-by-3xn_1"> archisdesign </a>; Adam Mørk via <a href="http://www.dac.dk/en/service-sider/press/press-archive/2010/close-up-3xn-mind-your-behaviour/">Danish Architecture Centre</a>

  • Marcel Sembat High School by archi5 with B. Huidobro -- Sotteville lès Rouen, France

    If there's a way to help the chronically disinterested and unaware youth of the world think twice about issues of sustainability, surely this is the way. Waking up every day to attend school in one of the most beautiful green-roofed structures in the world should be every child's right. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Thomas Jorion via<a href="http://www.archdaily.com/154206/marcel-sembat-high-school-archi5-with-b-huidobro/"> ardaily </a>

  • Marcel Sembat High School by archi5 with B. Huidobro -- Sotteville lès Rouen, France

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Thomas Jorion via<a href="http://www.archdaily.com/154206/marcel-sembat-high-school-archi5-with-b-huidobro/"> ardaily </a>

  • Diamond Ranch High School by Morphosis -- Pomona, California

    We can't help but wonder how many industrial designers or metalsmiths this school has inspired. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: <a href="http://en.wikipedia.org/wiki/File:DiamondRanchHS_-_CarolHighsmith_-_4.jpg"> Carol High Smith </a>

  • Central Los Angeles Area High School #9 for the Visual and Performing Arts by Coop Himmelblau -- Los Angeles, California

    Located just off the Hollywood freeway, this public arts school in the heart of downtown Los Angeles is known for -- according to the <a href="http://www.latimes.com/entertainment/news/arts/la-ca-art-school31-2009may31,0,4081776.story" target="_hplink"><em>Los Angeles Times</em></a> -- its stunning cone-shaped library, a soaring lobby opening onto Grand Avenue, a 140-foot tower rising above a 950-seat theater, and giant, circular windows. Granted, all this grandeur comes with a hefty price tag that's spawned an ongoing debate over a campus that "flaunts a district's-worth of design at one site." via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: <a href="http://www.e-architect.co.uk/los_angeles/central_los_angeles_area_high_school_9.htm"> e-architect </a>; <a href="http://www.worldarchitecturenews.com/index.php?fuseaction=wanappln.showprojectbigimages&img=3&pro_id=10892">World Architecture News</a>

  • Central Los Angeles Area High School #9 for the Visual and Performing Arts by Coop Himmelblau -- Los Angeles, California

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: <a href="http://www.e-architect.co.uk/los_angeles/central_los_angeles_area_high_school_9.htm"> e-architect </a>; <a href="http://www.worldarchitecturenews.com/index.php?fuseaction=wanappln.showprojectbigimages&img=3&pro_id=10892">World Architecture News</a>

  • Sra Pou Vocational School by Rudanko + Kankkunen -- Sra Pou, Cambodia

    Perhaps not as grand as some of the other designs we've featured, this rural Cambodian school's brilliance lies in the thought and careful consideration of the non-Western culture. Designed by Finnish architecture firm <a href="http://www.rudanko-kankkunen.com/" target="_hplink">Rudanko + Kankkunen</a> and built by members of the local community from hand-dried blocks of soil, the training center teaches local, underprivileged families to earn their own living in a colorful, inspiring space unlike any in the impoverished region. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Architects Rudanko + Kankkunen via<a href="http://n3un.com/2011/09/19/sra-pou-vocational-school-by-architects-rudanko-and-kankkunen/"> nuun design review </a>

  • Sra Pou Vocational School by Rudanko + Kankkunen -- Sra Pou, Cambodia

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Architects Rudanko + Kankkunen via<a href="http://n3un.com/2011/09/19/sra-pou-vocational-school-by-architects-rudanko-and-kankkunen/"> nuun design review </a>

  • Chromatic Play by Juana Canet Arquitectos -- Mallorca, Spain

    This green, yellow, and blue multi-purpose play space was added to an existing school. As much art as it is architecture, the outdoor room is magically "dyed by the chromatic play of the coloured glassed façade." via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Jose Hevia via<a href="http://www.archdaily.com/239432/chromatic-play-juana-canet-arquitectos/_mainimage_1337369572-juego-cromatico-07-1000x623/"> archdaily </a>

  • Chromatic Play by Juana Canet Arquitectos -- Mallorca, Spain

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Jose Hevia via<a href="http://www.archdaily.com/239432/chromatic-play-juana-canet-arquitectos/_mainimage_1337369572-juego-cromatico-07-1000x623/"> archdaily </a>

  • School Barvaux-Condroz by LR Architects -- Barvaux-Condroz, Belgium

    The antithesis of greige, this cheerful school with built-in play spaces and hiding dens is sure to motivate even the most sullen of children. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: M. van Coile via<a href="http://www.archdaily.com/234893/school-barvaux-condroz-lr-architects/lrarchitectebarvaux27/"> archdaily </a>

  • School Barvaux-Condroz by LR Architects -- Barvaux-Condroz, Belgium

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: M. van Coile via<a href="http://www.archdaily.com/234893/school-barvaux-condroz-lr-architects/lrarchitectebarvaux27/"> archdaily </a>

  • Maria Grazia Cutuli Primary School by 2A+P/A + IaN+ + MaO -- Herat, Afghanistan

    This project was realized by the <a href="http://www.fondazionecutuli.it/home.php" target="_hplink">Maria Grazia Cutuli Foundation</a>, established to honor the life of Maria Grazia Cutuli, a prominent Italian journalist killed on assignment in Afghanistan. The vibrant school "is an alternative to those models related to the after-war reconstruction emergencies." It includes a progressive "green classroom" and made use of local technologies and construction materials. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: <a href="http://www.ianplus.it/"> IaN+ </a>

  • Maria Grazia Cutuli Primary School by 2A+P/A + IaN+ + MaO -- Herat, Afghanistan

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: <a href="http://www.ianplus.it/"> IaN+ </a>

  • Les Vinyes Primary and Secondary School by MMDM Arquitectes S.C.P. -- Barcelona, Spain

    Inspiring aspiring Stanley Kubricks in Barcelona. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: <a href="http://www.eugeni-pons.com/">Eugeni Pons </a>

  • Les Vinyes Primary and Secondary School by MMDM Arquitectes S.C.P. -- Barcelona, Spain

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: <a href="http://www.eugeni-pons.com/">Eugeni Pons </a>

  • Kindergarten by Eva Samuel Architect Urbanist & Associates -- Paris, France

    One big, pink-frosted building full of magical, child-sized playhouses. via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Gaston Bergeret via<a href="http://www.archdaily.com/244133/kindergarten-in-paris-eva-samuel-architect-urbanist-associates/gaston-bergeret-_mg_1002_/"> archdaily </a>

  • Kindergarten by Eva Samuel Architect Urbanist & Associates -- Paris, France

    via <a href="http://www.flavorwire.com/320057/the-most-beautiful-and-imaginative-public-schools-in-the-world?all=1">Flavorwire</a> Image credit: Gaston Bergeret via<a href="http://www.archdaily.com/244133/kindergarten-in-paris-eva-samuel-architect-urbanist-associates/gaston-bergeret-_mg_1002_/"> archdaily </a>