Does Drug Interdiction Increase or Decrease?

The problem is that they are selling illegal drugs suck as heroin, cocaine, ecstasy, and crack. The idea is to reduce drugs because people are using drugs and you cant stop them form using it. They become addicted and the can become violent or thief. The equilibrium price of drugs rises from P1 to P2, and the equilibrium quantity falls from Q1 to Q2. 

The impact i have is that is really bad the idea of selling drugs, the have to stop selling that and to prohibitive to the people.

In my opinion we have to stop the selling of drugs because kids, men, etc, are using drugs and the become addicted and can kill people just for money to buy more drugs or the can make violent robbery just for money or for what they want and that's really bad.