I've heard that in some states it's against the law EVEN when it's printing.
Here in FL, is should be "hidden away from ordinary sight of another person". I don't think it's against the law per-say if it's printing here in FL. As in no charges against you, but I guess questioning from a cop COULD be expected.
Now, if I was at a super market and a cop approached me and said: "Sir, is that a gun under your shirt?". I assume I would be polite and inform the LEO that I do have a license and I would offer to show it to him right away. I would also apologize for the fact I printed so obviously, and promised that it would never happen again
Now having said all that... if he asked me to turn around, put my hands on my head and spread my legs... well... ain't much you can do about it at that point. However, from my previous encounters with law officers, I've learned one thing: They get sooooo much BS from people every day, that's it's best to just tell the truth and offer NO EXCUSES. How do I know? Try getting pulled over for going 90MPH in a 50MPH zone in NJ (Palaside Parkway)... then telling the cop, yes Sir, I was going 90, and yes sir I know the speed limit is 50. Sir, I have no excuse... and he said: "I appreciate your honesty, slow the f*** down, and here's a ticket for 74"... yea, 1 MPH more and my license was gone.
Anywaysssss, I think any reasonable police office just wants to make sure you're not a criminal. I think once he/she sees your CCW, and you are straight up with them, you'll be just fine. Friend of mine avoided a speeding ticket like that here in FL. Got pulled over, and handed the guy his DL and CWP. Cop said he appreciated that he let him know he was packing heat, even though he didn't have to tell him in the state of FL, and let him go with a warning.
They are just doing their job. Be nice and polite to them, and I'm sure they will find that refreshing after a whole day/week/month of dealing with scumbags.
Then again, you can always have a really bad luck and get noticed by a rookie on a power trip
EDIT TO ADD: Oh yea, if they asked if I or they can remove my weapon for the duration of conversation / stop I would agree. Searching through my pocket would get a polite but firm "I do not consent to a search officer", while being 100% cooperative. As in, if they say "turn around and spread your legs" despite me being polite etc, I would comply 100% and "live to fight another day" if you would ;-)