From the CCW application:
d. Are you an unlawful user or addicted to a controlled substance under 21 U.S.C. 802 Section 102 (this does not require a __ Yes __ No conviction)? If yes, please provide dates, times, and places of use. _________________________________________________
Obviously, as gun owners most of us have encountered this similar question on other related documents....that generally prevents progress in the expected direction.
So yeah, lying on the application(s), transfers, etc. or simply picking up a contrary habit afterwards falls somewhat outside the law.