[MichaelGG]

Key point:

"The result was that I was denied entry because I was on a business trip unannounced. The payment in the form of a warm meal at one of the shows in Nashville at a restaurant with ten tables is apparently illegal."

Well, yeah, sorta. If you come to perform a task and be compensated they might construe that as work. I'm not sure what he means by privacy violations - if his name is Googled, are there no results for his stage name? Did he have nothing in his items with his stage name? It seems odd to just assume CBP agents are doing something secret when this seems like public data.

I'm Canadian, and I was detained at the border as one CBP agent felt I needed a work visa (not just stating I'm there for business reasons) to represent my company at a tradeshow. (OTOH the unions at conference centers also agree that lifting a box or plugging in cables is work so...) Fortunately his supervisor disagreed.