Rehab is just the start...assuming hes somewhere good-everything there is afforded, food, good surroundings, people who listen.
What happens when he gets out? What's his aftercare/support group like? Is he gonna go back home to selling eighths and drinking domestics?
I would be very happy to be wrong about this but I dont believe hes ready to make that change. You think Fred will make it an entire 28 days? If some days without hard drugs keeps Freddy around for a little longer that's what's up