Bath salts apparently awaken the senses to a variety of tastes -- in this case, it's human feces.

A Georgia woman called police on July 3 to report that her son was acting crazy and "schizophrenic," the Atlanta Journal-Constitution reported.

"They told me that he was walking around with a knife talking about he's going to hurt somebody. And he also had been calling me being schizophrenic, talking schizophrenic saying his friends set him up," said the unidentified mom of 21-year-old Matthew Hammond in a 911 call.

When cops responded to the Gwinnett County home, Hammond was already outside and aggressively approached the cruiser, the paper reported. He allegedly had feces in his mouth and carried a knife. He started knocking on the officer's door, and even challenged the man in blue to a fight.

"[He] banged on his windows a couple times and actually grabbed onto the latch of the door trying to open it, saying ‘come on, come on,' as if he wanted to fight," Gwinnett County Police Corporal Jake Smith told CBS Atlanta.

BATH SALTS photos (story continues below):

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  • Bath salts

    This photo, courtesy of the Federal Drug Enforcement Administration, depicts what a packet of bath salts can look like.

  • Carla Murphy

    In Pennsylvania in July 2012, Carla Murphy had a baby, then allegedly took bath salts and attacked nurses and cops. <a href="" target="_hplink">Read more.</a>

  • Matthew Hammond

    Matthew Hammond allegedly snorted "a lot" of bath salts, ate feces and then challenged a cop to a fight, with predictable results in Georgia in July 2012. <a href="" target="_hplink">Read more.</a>

  • Rudy Eugene

    A medical examiner in Miami-Dade County confirmed that bath salts weren't to blame in the case of infamous naked face-eating suspect Rudy Eugene. <a href="" target="_hplink">Read more.</a>

  • Bath Salt Naysayer?

    A nude man in Florida was caught on tape in early July 2012 humping the air and screaming "Bath Salts are BAD for you!!!" <a href="" target="_hplink">Read more.</a> <a href="" target="_hplink">Entire video </a>from Youtube user gnomicmedia.

  • Shane Shuyler

    Shane Shuyler allegedly exposed himself to a 3-year-old while on bath salts in Florida in June 2012. <a href="" target="_hplink">Read more.</a>

  • Brandon DeLeon

    21-year-old homeless man allegedly growled "I'm going to eat you" and tried to bite a cop while cruisin' on some bath salts and Four Loko in Miami in June 2012. <a href="" target="_hplink"> Read more.</a>

  • Ronald Sellers

    Ronald Sellers of Tennessee was allegedly early on the bath salts trend. According to authorities, the man hallucinated a burglary and called the cops to his home while high on the street drug way back in February 2012. <a href="" target="_hplink">Read more.</a>

  • Bahad Mahmoud

    A drugged-out Mahmound was arrested in Louisville in June 2011 for disorderly conduct, among other charges, after cops found him drinking hand sanitizer. <a href="" target="_hplink">Read more.</a>

  • Robert William White

    A crazed 20-year-old man said to be high on the synthetic drug bludgeoned an elderly woman in the head in late June 2012, according to authorities. He claimed he was an alien who talked to Jesus. (<em>Los Angeles Times </em>reported.) <a href="" target="_hplink"> Read more.</a>

The officer accepted Hammond's alleged challenge by pointing a gun at him. Hammond dropped the knife and was arrested after a short struggle.

The suspect later admitted that he had smoked marijuana, drank alcohol and snorted "a lot" of bath salts, according to a police report obtained by the Atlanta Journal-Constitution. He was charged with felony obstruction and disorderly conduct.

It's just one of a slew of cases of violence tied to bath salts in recent months. On June 17, Pennsylvania mom Carla Murphy had just delivered her baby when she went on an alleged bath salts-induced rage, punching a nurse and trying to bite a cop.

Bath salts, a synthetic cocaine-like substance found in smoke shops and gas stations, can lead to paranoia and hallucinations. It's been federally banned, and many states are outlawing the sale of the drug while manufacturers consistently change the chemical makeup to get around the law.