I was in DC in May and "grabbed" as many of the area virtuals as I could. The very first night we were there we went to the White House virtuals and "found" them with no problems from any LEOs.
I will confess that I didn't read ALL the replies to this thread as my eyes started getting a bit buggy, so I don't know if any actual LEO's responded. I can speak, as an LEO, that once I learned about geocaching, NOT FROM ANY INTEL BULLETINS, it shed a whole new light on all those "suspicious person" calls I've been sent to over the years. As a geocacher and a cop, geocaching activity is about as close to "textbook" suspicious behavior as I've seen. Added that the cacher has a gpsr, or camera, or both just adds to the perceived suspiciousness. Citizens who don't know about caching, will call about ANYTHING. As I've read in other threads, I suggest you keep a copy of the geocaching notice to non-players, be completely honest and open. The "I'm not doing anything wrong, you have no right to stop me" response to a cop will get you nowhere fast! Understand they/we're doing our jobs and if you've got nothing to hide, it should be no bid deal. One last thing. The Secret Service cannot afford to blow off a geocacher and not investigate. Maybe it was a bit overboard, but the consequences of not doing their job are much greater than most LEO's. Stay safe.