Originally posted by jja327:
"CCW? Did LEO carry the 5906 with the safety on or off?"
That depended on the agency and their firearms instructors.
For example, L.A.P.D. trained to carry with the decocking/safety lever up, in the "fire" position. The word was, "Don't get caught with your dingus down."
At the same time, the L.A. Sheriffs Office taught to use the safety/decocking lever as a safety and flip it to "fire" during the draw stroke. The thought there is that, traditionally, one in five cops killed by gunfire are killed with their own or another cop's handgun. Having the safety lever "on" may cause the bad guy to take a bit of time to figure out which of the multiple levers and buttons is a safety and get the gun to shoot.
Both positions have merit. The main downside to using the lever as a "safety" is that, on the standard S&W and Beretta pistols, and most others with the same operating system, the safety/decocking lever is way up there on the slide, it is small and many people's shooting hand thumbs can't work it reliably and with certainty during the draw stroke.
I like the idea of using it as a safety. If I carried a standard d.a./s.a. pistol, I would find and install one of the oversize safety/decocking levers that were made by folks like Smith & Alexander. I have one floating around in case I ever do end up carrying one for serious.
There is no "right or rong" answer to this. Either manner can be good if the user practices until the use of the lever is instinctive.