Kraigwy: I pocket carry my 642 without a holster. I tried ever way from Sunday to get it to fire (empty of course). Just don't see it. Not with a 642 anyway.
I pocket carry my S&W 642 airweigh too, but I have a Charter Arms holster
I bought for less than $20 for my CA Bulldog. I only use the CA holster for
the S&W and the Bulldog in a Galco paddle hoslter. My 642 has no hammer
or reclused, so I don't believe one like mine can go off from being dropped.
That CA holster works really well when I draw the gun, it stays in the pocket
because of the material its made out of. I don't think the guns accidentally
going off are revolvers, unless they are old ones.