Some are bone dry, without even the required lubrication. I've pulled some apart and gotten sheepish looks when I clear the pistol, pop the slide assembly off and LINT and DUST fall out.
I've heard the same thing from a CHL instructor who was a police department armorer at one time. He said he'd seen police weapons so gunked and dried up they literally wouldn't even operate. The only time they'd been taken from their holsters was for annual qualifying, which in itself didn't amount to a hill of beans.
So yeah, just because somebody's an LEO or veteran doesn't automatically make him a Rambo. Not even close.