Stop the opioid epidemi? Prison and wall off the southern border. Nothing else will work.
Walling off the southern border won’t work. Instead, take all of the drugs that are confiscated coming across the border, break it all up into small baggies, load it all on a C-130 and drop it over every city in Mexico (or wherever it originated from). Better yet, simply fly it south of the border and dump it all into Mexico’s water supply. And do the same to China, since a lot of the drugs originate from there.