MC wrote:CBP gave clarification on this matter back in early April stating that additional concurrent TN work is fine but only part-time is acceptable.
That doesn't sound as helpful as it may sound at first glance, why couldn't you have two "full-time" positions? I know at least one doctor who could be said to be in that position, he was on TN-1 in Atlanta. Have you got a link to it?
Anyway the answer to his question is that you can hold multiple TN-1s concurrently, and in fact it was designed to work that way because of e.g. doctors who consult at more than one hospital in the US.
Steve.