Yeah, don't want any unfair competition to the manufacturers of booze and pills.
Personally, I think that the authorities are terrified of anything that could put a dent in the profits that are obtained from cocaine, heroin, weed, etc.
The "War on Drugs" has lasted my entire adult life, and I'm getting close to checkout time. I've always believed that some very respectable people are making some very serious money through a number of "deniable" cutouts.