There IS rehab, however, that means giving up your crutch and most can't or don't want to as they cannot envisage a life outside the one they exist in.
It means being randomly tested, opening up to things they may want to keep buried and, during the process, doing without the crutch.
Most of them have no friends outside street life.
They've forgotten what 'normality' is. Keeping themself clean is often a quick all over using stolen baby wipes, if that. In the end, they look like users and congregate in places where they know others in the same boat.
Many didn't start life in bad circumstances but were thrown a curve ball that knocked them off track.
Dealers often hang around near rehab centres and areas where users go to get their daily fix of methadone or subutex, like vultures waiting for their vulnerable prey.
Ketamine is another 'drug' added into the mix. In the end, they don't care what they take as long as the supply is there.
I have seen some awful things and I'm so glad that me and mine have steered clear of habits which can lead to destroying the only life you will ever have.