Way to go, Jon! Nice for a "first" run in. I'm glad your experience has been better than some. I know the guy who called you in must have wondered "WTH?". I'm glad management took it well and now they know its legal, they may be able to handle things easier the next time around.
My "MWAG" experience in Fredericksburg, VA was pretty much the same thing. The cop was very nice, very professional and just had to check things out. The restaurant manager was a little taken aback because he would have to write up the whole incident if things went hit the fan. Luckily, for all of us, the only one who got upset was the little lady who saw me and called me into the local police.