21 Jump Street S05E05 - Just Say No! High

When there's an outbreak of Ecstasy in a high school, Hoffs and McCann are sent to investigate. And it seems the school has a zero tolerance and has all the students take drug tests. When Hoffs takes the test, she comes up positive and is pulled out and is grilled by I.A. Mac decides that the student who spearheads the anti-drug campaign at the school is a person of interest.