I had an M&P .45 w/thumb safety a while back,and only some slight polishing of internals to smooth out the grit. But it still had that hinged trigger,that required something like a finger pad to engage top and bottom to pass through the guard,a similar feature to the safe/action Glock's.
Perhaps a pack of gum lodged in the holster?? I'd like to see the forensics of this one. Of course this reminds me of a recently posted NYPD trade in Kahr K9 over at another forum. When it was stripped down it was rusted together at places like the striker to it's channel,and had what looked like melted gummie bears inside the grips. And it was a STAINLESS gun at that,looked like it was fished up from the Titanic wreck!
Who knows how bad this Detroit cop's piece was taken care of. Pics or it didn't happen,heh...
Here's the NYPD gun..