"So far, the technology only works from a distance of about three or four feet (about one meter), although NYPD Commissioner Ray Kelly hopes that its range can ultimately be extended to at least 25 meters (82 feet).
The plan is for the scanner to be mounted on a van, then used on suspects who would otherwise have to be physically searched." ( - http://www.gizmag.com/nypd-portable-gun-scanner/21147/ )
If it gets to the point that a van is allowed to scan past clothing at 25 meters, at the whim of a policeman, I think that the 4th amendment implications are grave, however, I don't think it's infringing on the rights of CCP owners directly, as it would only help enforce a law - a law you could more astutely claim is infringing on 2nd amendment rights. (Welcome to the shall/may state debate!)
Given that I don't live in a state that issues CCPs to citizens, it's already a moot point. I don't carry a gun because it would be a felony to do so, and this only allows the police to actually start cleaning up the guns carried by those who don't worry as much about felony violations. (i.e. The concept works under the presumption that we're all supposed to be unarmed.)
"New York gives wide latitude to the county authorities in issuing pistol licenses. In New York City, a concealed pistol license is allowed by law, but detractors have claimed it takes a large degree of wealth, political influence, and/or celebrity status to obtain.[33] In contrast, many rural Upstate New York counties are effectively Shall-Issue in their licensing policies, and some rural upstate counties have policies that allow unrestricted concealed carry after one has obtained a state carry permit." ( - http://en.wikipedia.org/wiki/Concealed_carry_in_the_United_States )
Given that New York isn't completely may-issue solid it might not make the same amount of sense in application, and provides a glimpse into the de facto decisions of the enforcement on this issue - implications that may bother some gun owners in New York.
(It should be clear, but I wanted to make sure to mention, IANAL.)
"By the time they had diminished from 50 to 8, the other dwarves began to suspect "Hungry." -- a Larson cartoon