and this one more to the point
Canadian denied entry to usa trade show
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A B.C. sales representative who markets equestrian products in Canada was barred from crossing the U.S. border to attend a trade show last month by a U.S. Customs and Border Protection officer who accused him of trying to steal American jobs.
Borsteinas said he was then fingerprinted and sent back into Canada. The border officer warned him
if he tried to enter the U.S. on business again, he should expect to be prosecuted.
http://www.cbc.ca/canada/british-col...ectionism.html