can TN visa holder works on 2 jobs?

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Registered Users (C)
I am working here under TN. Now I got another offer, and I will accept the offer. I need go to border to apply a new TN under new employer. The thing is thet my old employer like me to do a part time job on the weekend for them, and my old TN expires 03/2007. Can I work for 2 company with 2 TN? If so, do I need re-apply my old TN because I am going to change from fulltime to parttime? Any advises are very welcome.
 
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