Nasty goings on
Back in the mid 1990s when company internet was often a bit "Wild West" we installed some monitoring software, we alerted everyone. 3 days in and we had a list of executives who wished to be placed outside the monitoring!
This is made us curious and while most was just idle time wasting one gentleman had a paricular taste for some very unsavoury material, it was CP. It was reported and the Police had to be called in and luckily I wasn't involved but a colleague had to attend the proceedings and had the unpleasant job of cataloguing some of the items for evidence before handing over the PC. Back then things were not so good as they are now and they had only basic phone counselling offered afterwards, they had simply try to forget what they had seen. Not a very happy ending.