A co-worker recently west shopping in Freeport Maine (L.L. Bean) and then two days relaxing in Rockland.  He and his wife drove into Maine from New Brunswick, crossing the US-Canadian border at Houlton. There were several lanes on the US side, marked with temporary orange traffic cones, some with red lights, others with green, and he pulled into one of the lanes.  "You're in the NEXUS lane," one of the border patrol officers yelled, "and you committed a federal crime."  He was told to pull over and to go inside the building for "special" questioning.  

Inside, they called a senior official, who came out, wearing a gun and boots ... very Gestapo.  He reaffirmed to my friend that he committed a federal crime and that they now had the right to search his car and all his personal effects.

Jeff said, "I did not commit a federal crime, I made an honest mistake."

And that's when it hit the fan; when a Canadian citizen challenged a US Border Official.  

I'll stay right here in Canada, thx.