Just search 'officer shoots self in leg holstering' or 'officer shoots self in leg' and dozens of news reports will show up. Most are with Glocks which are labeled as DAO but as stated previously, these are actually closer to SA than they are to DA trigger pulls.
I was looking for the one story in particular where an officer shot himself in the leg when the inside string of his jacket (the one that secures the liner to the main coat) slipped over the trigger and pulled it discharging his Glock. Couldn't find that one but I thought this story was a pretty good example. I'll stick to my DA/SA triggers thank you.