My sister worked 2 crime scenes in Harris County (Houston) where glocks were involved and that they had jammed. the owners said they were loaded with reloads.
one was a home owner, an asian gang kicked in his door to rob and burgle(?) him and his house. He anwered their actions with a Glock 9mm, it jammed and being a competition shooter then reached for his highly accurized and decked out 1911 .45ACP and killed one and the others hopped in the car and drove away, with him in the street firing at their car.
the other was a sheriff's deputy. He stopped a suspicious suv full of teens. he ordered them out of the vehicle, one stayed hidden in the suv. the hidden teen popped out of the suv firing at the deputy, he returned fire and his glock jammed. he crawled under his patrol car to escape the rounds, he was hit in both arms, if my mem. serves me correctly. A citizen driving by stopped, came out his pickup with a CZ 75 9mm and started blasting at the teens. this is pre CCH, but I'm sure he had a good reason to be armed in his pu. The teens scattered and he turned to the deputy and saw a young male running toward the deputy with a gun in hand, he didn't know if he was a good guy or bad guy, decided not to fire at him. It was an off duty deputy coming to help. long story short, deputy survived, LEOs swarmed the area, house to house search, found all the bad guys. oh yes, it turned out to be a stolen car.
oh BTW, The Sheriff's Office gave him an award. Winchester gave him a case of 9mm to practice with, none of the bad guys were hit.