“Habitual pot use makes you a prohibited person under federal law, even if pot use is legal under state law
That may be the case if you could prove his pot use was habitual and there was evidence of some type of legal action taken against him regarding that issue.
Until the Gun Control Act of 1968 is changed, having a Medical Marijuana card is sufficient to make him a prohibited person.
Or if he tests positive for Marijuana, his pot use is current and that alone is sufficient.
There is no requirement in the law to show any sort of legal action was taken against him for pot use. Any evidence of current pot use and evidence of firearm ownership is sufficient to be charged and tried.
So all I was pointing out was that your statement "Do you want to revoke the gun permits for everyone that drinks alcohol or gets high on pot?" is already federal law.