How effective are substance abuse treatments?

I have recently convinced my husband to undergo a substance abuse treatment, and now I am searching for an addiction center that will fit him. But just a few days ago, a friend of mine called me, and said that his son went back to using drugs after two months of abstinence. Now, that gives me doubts if treatment programs can effectively help my husband. Is relapse a normal occurrence? Will I keep my trust on addiction treatment programs?

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