how do you "remove poverty"?

It's not like "poverty" is a substance you can wash off, or extract, or amputate. Poverty is a lack. Too often it's not as much a lack of money as a lack of effort. There is a market for the drugs and like all markets, eventually a supply shows up if the price is right. Police action raises the price to make it right, and the forces of supply and demand surge. The more you penalize something, the greater it's value becomes.