How legal are Class 4 laser pointers?

Are Class 4 laser pointers 100% legal with regards to selling, buying, transporting, etc? Other than trying to blind people and blasting airplanes, is their use pretty much unlimited?

I'm asking because I'm also a drone pilot and regulations are really tightening up.

I have to admit that I have a decoy/donor laser I paid $5 for in eBay...in case I'm forced to forfeit one.:D