Next time he faceplants on the sidewalk, drive him to the ER, not the jail. If BAC is too high to house him safely, your jailor will refuse him and make you take him there anyway, at the very least until he sobers up enough not to die in custody. Even if s/he will book him in, he won't stay long because he'll have to go to the hospital as soon as he starts having seizures from the withdrawals. When his blood pressure gets too high, he'll have to go. A hospital social worker will know about all the resources available in your area and can take it from there.