Is drug addiction treatment really effective?

What does it do? I was just wondering since a cousin of mine is undergoing this kind of treatment and I want to know what difference it will make aside from making him stop taking drugs and alcohol.

More Meth Drug Addiction Info:

• vacation blog » Blog Archive » Prevent Your Kid from Taking Drugs
• Reports: Thaci's cousin “cost budget millions” | ICT magazine
• Street drugs seroquel | Webkrasles.spb.su med blog
• Trike Fun with her cousin “Bean” « pressed but not crushed
• Narconon's Outpatient Drug Rehab Dallas Texas | Drug Rehab Blog
• How do you keep from having panic attacks without taking drugs …
• Amy Winehouse's Boyfriend Back on Drugs! | Showbiz Spy – celebrity …
• Mr. President: Free Brother Irving and Cousin Gail | RedState
• One In Six Doctors Hooked On Alcohol Or Drugs : Kevin Trudeau Show
• A Guide for Educators of Children Affected by Alcohol and Other …