An arguement can be made for "Israeli Carry"; empty-chamber. Especially for beginners at home. If your carrying, then you better be pretty confident of your skills drawing and chambering rounds under stress. You can rack the slide off your heel if your down and one-handed. (All this is theoretical. I don't get in that many gun fights.)
The point is with all guns and especially glocks, once that round is in the pipe, you damn well skippy keep your finger off the trigger and put it in a holster as above.
Read Plexico Burris story (G40 slipped down warm-up pants and he grabbed it.)
Also Pilot in Atlanta sent round through plane. See blutube search TSA. Holstering and re-holstering loaded weapons is a bad idea. )
"Hw Who Dares..Wins"