I was following links, and went over to Tam's place. Tam is a great resource, by the way. If you don't read her regularly, you're missing a treat. But I digress.
Following a link, I went to Gun Nuts Media, where I find this little article: Concealed Carry advice: When to press-check your gun.
Short answer: Never. Seriously. I thought we'd been over this. If you're a concealed carrier, you should know, to a certainty, if your weapon is loaded or not. If it is loaded, leave it alone. If it's not loaded, then you should have loaded it before you holstered it. An unloaded gun is a prescription to disaster.
Doing a press check is a neophyte drill. If you have to check your weapon's status, do it in private, safely, then put it in the holster and leave it alone.