Are you an unlawful user of, or addicted to, marijuana, or any depressant, stimulant, or narcotic drug, or any other crontrolled substance?"
If say a year or 3 years from now, his record is clean, and he doesn't do drugs, he can truthfully answer 'no' to that question. The question is in the present sense, any two-bit lawyer could argue and win against the state on that one if no drugs are presently being used.
The actual questions on the purchase form are actually pretty rediculous. Only a few of them can be proven one way or the other with hard evidence, the rest are just subjective questions about a persons intent. That's what we get when we have socialist leaning lawmakers- a lot of feelgood bullsht and good intentions but no real plan to affect any outcomes in a positive way.