Thermal imaging sensors have been export-restricted for some time, though the details depend on the type of sensor. Here's a handy chart from DRS Technologies, which makes thermal sensors:
I recognize that there have been imaging restrictions in place for some time. It is not just thermal imaging, there is a frames per second ceiling, but I do not recall the number. I think the "Camera Wars" are around the corner because the prices are coming down dramatically not because of new legislation.