it would depend on what you consider a drug. for example, marijuana is not a drug and alcohol is. so would this apply to alcohol? how about tobacco, which is extremely addictive and hurts others directly when smoked in their presence? and if the confinement involved a 12-step program the addict would be going from one addiction to another. there are also all kinds of legal considerations. being an addict is not, in and of itself, against the law. who gets to decide who gets confined, where, when? there is such a thing as illegal confinement.

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I know it's not the topic of your post, but criminalizing an addiction is ridiculous. The U.S. does it because it makes them money in the prison system.

Too many variables here. First, what drug? Second, what law was violated? Possession? Dealing? Third, is there an addiction problem? Some people can even 'chip' heroin and not become physically addicted (although it's a dangerous chance to take). Third, is it a first time offense? or the 13th?
Once those questions are answered, as mentioned below, forced treatment is almost never effective for very long. An individual needs to seek treatment for themself. Pretty much all you can do in the meantime is try to keep them safe from violence or overdose and hope they hit bottom and ask for help. Even then it often takes multiple trips to rehab. Think about how addictive cigarettes are and how much trouble people have quitting. Many drugs are worse.

Offense of what law? Possession? No. If they're commiting thefts and violent crime attributable to the habit/mental illness, maybe. But yeah, what wangobango said. Decriminalization largely removes the cycle of victimization over drugs.

No use to confine anybody to a drug program if you don't treat why they are taking those drugs in the first place. A a person who takes drugs is a person who feels alienated from society and family, and that is a hard one to fix.

Yes.Even if he or she is not yet addicted, he or she is on the path to addiction. And, the disruption to his or her daily life would make him or her think again.

No, I would legalize all drugs.

It would be a good idea, but there aren't enough drug programs, and they frequently don't work the first time.

I believe this type of program would be better than sending a person to jail. This way it gives them a way to be productive again and have a life. I am not sure what I would do with a relapse and would welcome some suggestions.