To my knowledge, ITAR just deals with products/information going from the US to outside countries.

I just purchased a 150W c02 laser from China. When you import a laser from China. The FDA starts to care. They require that the import lasers that have an associated FDA Accession number for the product. Basically saying the laser is safe and has proper safety etc.

Having a customs broker for your first transaction is worth it's weight gold.

In terms of importing these lasers from China and selling it in the US market? I think you're a couple years late on the market for that one ;) There quite a few players that do that now.