The following applies to SC and NC, and I presume- much of the USA-
Being "detected" isn't a problem if the CCW holder is being prudent. Your weapon must remain concealed at ALL TIMES unless you plan on using it.
Keep in mind, in NC "open carry" is legal (technically NC is a "anomalous open carry state" which means open carry is leagal, but the state may lack preemption or there may be other significant restrictions). I'm not a lawyer, nor do I open carry, so I don't follow the open carry laws. Bottom line though, this means IMO (and I could be wrong) that if you pass the legal rquirements set forth by the local county sheriff to obtain a handgun permit (which only allows you to buy a handgun, not carry it concealed), you have the right to carry the sidearm on your person in plain view of others (I also assume, perhaps incorrectly, that you are not allowed to open carry where sidearms are prohibited by NC state law).
I mention this only because your comment can be construed as it being illegal to actually have the sidearm on ones person in plain view in NC (seems that SC does not allow open carry, I could be wrong).
A decent source of information for each indivdual state, just click onto the state in questio...
http://opencarry.org/opencarry.html
Another decent site for state reciprocity (which state reconizes other states permits, again, just click onto the state)...
http://www.nraila.org/recmap/usrecmap.aspx
Needless to say, quoting an internet site to a law enforcement official may not get you very far

What still has me perplexed is Vermont. They are one of the most liberal states allowing gun rights, but the state is VERY liberal pertaining to everything else as well (makes California look conservative at times when I spend time up there).
That said, you'd be surprised on the amount of LEO's who don't know their own state conceal carry/open carry laws. I was once informed by a state trooper in Utah that my .44 was illegal to be carried with a round "ready to fire" in the revolver, as well as a semi auto handgun being illegal to carry with a round in the chamber. Needless to say, I sincerely thought he was incorrect, but it was actually a nice conversation due to a speeding ticket, (
26 in a 25 and it was a rental vehicle) and I was not going to argue. Note, I did have an out of state permit that was reconized by the state of Utah.
What's interesting is (and I've gone through the process in three different counties in NC before I applied for my CC permit), is that each county sheriff's office has different procedures/paperwork/requirements to obtain a handgun permit (makes no sense to me). At the time before I obtained my CC permit, you were able to obtain a total of three handgun permits on one application. All that said, the NC law had been changed some years ago so that if you have a conceal carry permit, you don't need a handgun permit to purchase a handgun, and can buy a handgun the same day as long as you can produce your conceal carry permit.
Personally, what would be nice, is if there was one "national standard" that was accepted by all 50 states, so any type of handgun licence would be reconized in all 50 states (driving is a privilege, not a "right", yet your drivers license is reconized in each state to allow you to operate your vehicle).