So far so good! It is the right direction as long as the addict has admitted they have a problem and they are not still in denial. Denial, while part of the drug addiction, is also a roadblock to recovery.
It would not be the first time that an addict has agreed to go to rehab while still not truly admitting they have a problem with drugs. They may go thinking it will soothe the family and get them off his or her back. The problem with that is; they cannot fully recover as long as they are in denial. They can go through the motions, lie to the counselors and do everything they are supposed to do. If they don’t think they really have a problem, though, they are wasting their time and everyone else’s times. If they get away with this (some counselors can see right through this while others can’t), then they come home and the same behavior starts all over again.

Even if the addict does not fool the counselors, they can only do so much if someone is still in denial. Eventually, they have to let the person go home. The addict may even improve for a few days, but eventually, the old habits return. They do not take responsibility for the damage they are causing themselves or their friends and loved ones. While some people do start out in rehab while in denial, many admit their shortcomings along the way.
They really will get nothing out of it. The treatment plans in place in most rehab centers include sessions that normally get the addict to open up about their drug use and how it is hurting everyone around them. Denial hurts loved ones, there is no mistaking that. But most of all it hurts the addict who will continue to care only about his next fix and how to get it. If someone you love has been through rehab and is still in denial, talk to a rehab counselor and see what can be done.
[...] use of denial. Sometimes consciously, but usually sub-consciously, their brain begins to use the defensive mechanism of denial. The use of that mechanism allows them to believe that they really do not have a drug problem. [...]