A friend of mine did some consulting work for a bank in the past. The developers working on the internet banking software didn't have access to the production database but my friend noticed that in-house developers are too much into the logs without any issue to investigate.

Long story short they were looking at audit logs (textual data) of specific customer they wanted to stalk.

He talked to their manager, in-house developers got reprimanded and my friend got a different assignment.