I bet my life on a Beretta 92FS, for about nine years, and I followed safety regualtions, which was round-in-chamber, and decocking lever down (safety on). I practiced assiduously pushing the decocking lever UP, when drawing from the holster. That too was the training instituted, and required. I got to be very fast with getting the Beretta out with decocking lever up, and on target.
I know of seven peace officers, who shot themselves in the leg, when holstering their Berettas, when they just KNEW 1,000 times more than the instructors, who kept hammering at them, "Lever down and it stays down, when holstering.!" So, they'd either leave the pistol cocked, lever up, or, decock, then raise the lever to "Fire" position. But then, what the Hell does a trained firearms instructor know?? (Those 9mm bullets make big holes at contact range, boys and girls.)
I know another peace officer who is alive today, very simply because he carried his Beretta according to Dept. safety regulations, round chambered, decocking lever DOWN (on Safety). He and his partner, were jumped by multiple assailants in an ambush situation, outside one of the projects in Los Angeles.
While he was fighting with three of the bad guys, another managed to jerk his Beretta from his holster. The Bad Guy kept aiming at point blank range at the officer, pulling the trigger. Nothing happened. He pushed all the buttons except the right one (decocking lever), and even the magazine dropped out on the ground, but he couldn't get the pistol to fire.
Meanwhile, the officer managed to get one hand free and pulls his backup S&W 36, and caps a round through the bad guy. Bad guy drops the Beretta and staggers off.
P.O's. partner is fighting with several other bad guys and is screaming, "They've got my gun, they've got my gun!" One bad guy was just getting his Beretta free from the holster when the first P.O. jumps to him and at contact range, blows his brains out with Model 36.
Point here is, if the peace officer had been carrying his Beretta with the decocking lever in the "Fire" position, he and his partner would both have been undergoing autopsies on a stainless steel table the next morning. Thankfully the Dept. issued Berettas rather than Glocks or SIGs.
If you practice pushing that decocking/safety lever up, the instant you pull that pistol from its holster, you'll do it in a real life situation, cop or not. Believe me, I know.
JMHO. J.B.