As previously pointed out by Bartholomew Roberts and dogtown tom state legalization does not do away with federal law and violations of federal law.
See question 11(e) of Form 4473 below:
I believe that for knowingly making any false statement or representation on Federal Form 4473, the penalty is 10 years.
NRA Life Member - Orange Gunsite Member - NRA Certified Pistol Instructor
"When plunder becomes a way of life for a group of men living together in society,
they create for themselves in the course of time a legal system that authorizes it and a moral code that justifies it." Frederic Bastiat