we had one cop claim disability for "stress" and he won....the stress might have come from going to law school full time while practicing cop.....
outside of govt work I know the unions work full time to get their lakeys more money.....my fil who heated his whole house with a wood stove inside the house, plus also burned used car oil inside, plus ate smoked meats with lots of good carcinogens and who also smoked at one ti to his lungs OVER THE PHONE......resulted in a nice little check for my fil....probably some nice kickbacks for the dr and his staff...
You might not, or might, believe this but this particular thing has happened quite a lot.
UC work (undercover) is extremely stressful to begin with and using drugs, which many times is the reason one is UC, is a required part of the gig. Trying to "fit in" to the 'scene.' It makes for a very powerful combination and many succumb to addiction as a result.
I am NOT trying to justify any thing here - just offering an explanation for the occurrence.