S4·E11 In With the 'In' Crowd

Denise Kelly is a cop going undercover to stop a drug ring at a local high school. Jonathan and Mark pose as counselors to see if they can find who is bringing cocaine to school.

Mark and Jonathan set up surveillance outside party between Denise and Mike to see if he knows anything about the cocaine.

When Mark and Jonathan later meet with a faculty of the high school they find out everyone isn't pleased with the tactics used in trying to figure out who is bringing the cocaine in to school. Mark learns he made a big mistake when the parents of one of the students asks him to play the tape between Denise and Mike he later learns that he stopped the tape because they weren't talking about drugs.

This mistake nearly costs Mark & Jonathan their jobs and almost costs Mark his life.