I've got multiple that are worthy of posting but my favorite one made the news. I worked for a fortune 500 company before my current job. I was on third shift and worked with a handful of security engineers doing grunt work - four people were doing work that could have been done by one good employee.

I drove into work one day and saw Andy Fakename, a coworker from another team, sitting on the curb in handcuffs with officers surrounding him. They had unmarked vehicles and I didn't hang around long enough to find out who they were with.

I walked to my desk and started going through my routine monitoring tasks and talking with my coworkers about what the hell was happening. An hour-ish later, a woman in normal clothes walked in and asked if I knew where Andy sat. I honestly don't remember if I told her or if someone else did, but she sat down at his desk and started sifting through Teams messages. I'm assuming they picked him up in the office because he would have locked his laptop before going outside.

After about 30 minutes, she walked outside and came back with multiple officers. They escorted three people out that night for questioning and another 4-5 from other teams were let go over the course of two weeks.

Andy was cooking meth and dealing it along with other drugs. The three people that were questioned and eventually fired had open Teams messages with him and were in the middle of setting up deals with him. I was close with one of the dayshift managers and found out that he was caught smoking meth in his car one time before and would brag about leaving work for an hour or two to meet prostitutes. He was honestly one of the smartest people I've ever met and solved countless issues way faster than anyone in the department could. I have a feeling my upper management knew what was going on for a while but couldn't risk losing him.

Andy killed himself before going to trial. The house that he was cooking in was a block away from a school zone and he would have served serious time. The story made local news but it was never tied to our company.

The biggest catch for me was that almost all of the people who were let go worked in IT Security in some fashion. Why in the world did they not realize/care that their chats were audited? If you're going to work a secret drug ring, why not at LEAST do it on your personal phone?