Back in ~1999, there was a Maine dealer at a MA gun show. He proudly bragged to me about selling a couple of LE-restricted AR15 mags to some unsuspecting customer for $15 each! I ripped him up one side and down the other, he also got a call from Ron Glidden and the idiot admitted (probably on the PD's recorded line) that he had indeed done that. Later he threatened me at another MA gun show, so I had the promoter (Carole) boot him from all her shows!
So Jon is right, we don't own the corner on idiot dealers! They are indeed everywhere and they do give all of us a black eye!