According to the student, who has chosen to remain anonymous, she started selling pot brownies to sick patients as a side job in order to afford the university's tuition, which comes out to almost $40,000 per year.
The student had no idea she was doing anything wrong until one of her classmates got sick, according to local news station KOMO.
"My roommates got ahold of some of [the brownies]," she told KOMO. "They ended up selling them to a freshman girl."
When university officials were alerted to the situation, they suspended the student, who has now lost her tuition and will not graduate on time.
Although marijuana -- both recreational and medical -- is legal in the state of Washington, the university has a a drug policy that "prohibits the use, possession and or distribution of marijuana" on campus. This policy is in line with the Safe and Drug-Free Schools and Communities Act, according to Dean Forbes, a Seattle University spokesman.
"Universities must have policies in line with the federal Drug Free Schools law or risk losing federal financial aid for its students," Forbes told The Huffington Post. "Universities are prohibited under federal law from discussing cases or actual facts regarding personal records of students."