Well the above experience shows that it is a SUPER good idea to carry video & audio recorders, the stealthier the better. Why? Imagine if the greeter never said anything to you & let you go by, then called 911 and said you refused to leave when asked? Who do you think a jury is going to believe? A nice little old man or the "gunslinger" who scared the crap out of everyone ...including the "children"? In the past OCers have sent copies of audio/video to wal-mart corp. & they contacted the store in question to resolve the issue.
Just food for thought - It's not just bad police & bad guy's we need to worry about, it's also members of the public who may have agenda's of their own. Today it is often up to us to prove our innocence and others guilt. The system of "justice" is very easily twisted by a liar with or without a badge.