One idea that I have not thought through well, and don't know what the consequences would be, would be to instead of possession of sale of the drugs being ille

One idea that I have not thought through well, and don't know what the consequences would be, would be to instead of possession of sale of the drugs being illegal, making it so that, for some collection of other crimes, if the crime was committed in a way related to the drug, the penalty for the crime would be greater. The idea I was thinking is that this would create a disincentive to have the crimes and the drugs related, and might cut down on "drug crime" more than just removing the ban on the drugs? I believe I've seen some say that even where a drug is legalize, there still remains a black market for that drug in that situation in order to avoid taxes on that drug. If tax avoidance had a greater fine if caught if money from (non medicinal) drugs was involved, would that perhaps discourage sellers from not paying taxes on the income, and as a result reducing the black market type stuff? I don't know. I am not saying that I support this idea, its just an idea I thought was interesting. I don't know what one would reasonably/realistically expect the results to be. Does anyone have any ideas as to what results would result from such a law?