The very dark side of internal security
We used to do the same thing back in the 1990s, but this wasn't a joke. After someone was caught with some CP on-prem we installed proxy and monitoring software,
We had one of those, but luckily we'd already got the proxy and logging. So police called, offender got fired on the spot and I think 5 years. Raised some interesting questions though, like making sure the logging could be useful as evidence. Plus policies and support for the ISG folks who sometimes had to look at some really nasty stuff. We ended up with a system where HR, ISG and counsel would view evidence and make a decision, and sometimes you could tell by their look that they'd seen something very bad.
It still suprises me that employees still do this though, despite warnings.