I have been a deputy sheriff since 1991 and currently serve as my department's full-time firearms instructor. About 5 years ago while still working uniformed patrol, I bought a ProTac 2AAA, to carry in my shirt pocket as a supplement to my belt carry light (from another company) as well as my full size, SL20LED.
For the past three years, I've carried the ProTac in my daily duties as the Principal Firearms Instructor. The light is used for my personal needs as well as for low-light training demonstrations.
This past Sunday afternoon, I was doing some laundry in prep for the week and threw in a couple of pairs of pants. Just after starting the machine, we hear ta-tink, thunk, thunk, etc. My wife asks what I have in there and I tell her just some pants, thinking it's the zipper or buckle. 40 minutes later the chime dings and I go to move the load to the dryer. When I open the door, there's this light shining at me from inside and I know our washer does not have an inside light. It was the ProTac, which had been clipped to one of the pants pockets. I took it out, gave it a once over and everything worked just fine. I ended up taking the batteries out and leaving it open overnight just in case. Put some new batteries in Monday morning and it's no worse for wear.
I had thought about putting it through the dryer as well, but my wife said that would not be a good idea.