When Can You Infringe On Others Choices?

[lehighguy]

For this hypothetical we will assume the following. Someone is abusing addictive drugs that cause them to act in a dibilitating and potentially dangerous manor. I will use a set of hypothetical substances for the polls.

We will also assume you have a 100% effective enforcement method that has no social or financial costs or side effects other then the infringment of another's freedom to use the drug (no use of the drug will be allowed at all).