Denver Post: Brian Vicente, one of the state’s most prominent medical-marijuana proponents, calls it a “travesty.”

Tony Fabian, one of the state’s foremost gun-rights activists, says it’s evidence of “hostility.”

What has forged this quirky convergence of advocacy — tokers, meet shooters — is a September letter from the federal Bureau of Alcohol, Tobacco, Firearms and Explosives saying it is illegal for medical-marijuana patients to own firearms.

Everybody who buys a gun must fill out ATF Form 4473, which asks: “Are you an unlawful user of, or addicted to, marijuana or any depressant, stimulant, narcotic drug, or any other controlled substance?”

Answer yes, and you don’t get the gun. Falsely answer no, and you’ve just committed a crime.

The ATF’s letter, sent out Sept. 21, clarifies that the bureau includes medical-marijuana patients in that group of prohibited buyers because their marijuana use is inherently illegal federally.