Drugs bust
I used to work for a charity, and one of the things we did for a while was respite type stuff for kids with ADHD etc who had been excluded from schools. We had two sessional workers who basically took this kid out to ostensibly educational trips every weekday until he found a school place.

One of the workers (i'll call him Dave) was bright, on the ball and able to function, the other (Chris) was a little bit more naive.
Me and another colleague hatched a plan that we got Dave involved in. We told Dave we were going to do a fake drugs investigation that we wanted Chris to go in the frame for. I gave him a wrap containing talcum powder,, which he kept on his person.

Dave's job was to make subtle ish references to a cocaine habit throughout his day with Chris, which he did very well.
When they got back sans the autistic kid, me and my colleague called them both aside and I said "look, we need to have a word with both of you separately. I imagine one of you knows what this is about. Dave,, you first" and then walked to the office.
Dave then took out his talcum wrap and discreetly said to chris "look are this for me mate, they know it's me, I must have left some lying around but they have wanted rid of me for ages" Chris stored it in his pocket.
We sat in the office for half an hour as Chris waited outside, then eventually let Dave out, still laughing and joking with him.
We called Chris in, explained that we had found some cocaine in the kitchen, and we had just interviewed Dave and he had told us "I didn't want to get him in trouble, but Chris is always going on about taking coke, I think he might have even done it at work"
Chris's face literally drained of colour.
"empty out your pockets please Chris" : he actually did so, even putting the wrap down along with his keys "honestly, it's dave's, it's not mine"
At that point, my colleague pulled on a pair of rubber gloves used for when staff did personal care, and said "we will have to check whether you have anything else hidden. You do understand that the police are on their way, and it is better if we have found everything first" Poor chris then put his hands palms down on the desk, and me and my colleague both cracked at that time and couldn't keep it going any longer.
"You cunts", Chris said.
(clinteastwoodbradfield, Fri 13 Jan 2012, 10:08, Reply)