Of course, the motive the make these extremely powerful drugs is to make smuggling them easier.
We had legal opiats, over the counter, in the U.S. for decades before they were regulated by the Federal government at the start of the “progressive” period.
Where were all those poisonings you are claiming would happen, then?
I think his reasoning is if anything is legal, people will then use it for mass destruction. Sounds like a liberal about guns.