Andrew, my Dear Son Andrew

Andrew is an addict.  Of the worst kind.  He was once labeled as a "garbage can junky" - it doesn't matter what the drug is, he will do it.  He will use whatever is available.  But benzos are his favorites.  Alcohol and Robitussin run a close second.  Right now, alcohol has been his downfall.  A mere week ago, Andrew was living in a Chemical-free house; the first time he has lived on his own.  He loved it and was excelling at it.  He was working at Cantina Laredo, a prominent restaurant and making great money.  Then he was caught with alcohol on his breath,  failed a breathalyzer and was promptly kicked out.  The program he is in is set-up so that he would go back to rehab for X number of days and then would be able to come back to the chem-free house.  Instead, Andrew felt he was wrongly done and came home.  He felt it was unfair to have only had "one" beer and lose everything he had worked so hard for. 
He came home with grand schemes to get his license back, continue his job, and go to outpatient treatment for a few weeks until he satisfied the requirements of the chem-free house and could go back.  There were some major flaws in his plan, one major flaw being that transportation to and from work and outpatient treatment is simply unavailable.  Another is that he is not able to live at home anymore.  This has been discussed time and time again, but is ignored at Andrews whim. 
All week I have tried and tried to get Andrew to face the reality that he is not an elitist, that he is not above the rules, and that he has even pushed aside the principles he has worked and strived to live by.  I have tried to push him into going back to rehab.  It is much like pushing a rope uphill.  Eerytime I gain an inch, in steps his girlfriend and all is lost.
Unfortunately, his girlfriend wants a party companion instead of supporting Andrew in any efforts to clean up and stay straight and sober.  I could say so much more about this destructive relationship, instead I will sum it up by the accounts of a movie "The Days of Wine and Roses".
It has been a very difficult week, I have been down, but not out.  At first I was confused and did not know what to do.  All I knew was that I could not go through a repeat of the past.  He has to leave, one way or the other.  Rehab, his girlfriends', a homeless shelter, whatever he chooses....just not here.  I have yet to set a date.  That is extremely hard to do, because one has to follow through.  Shall it be Friday at five?? 
I love my son dearly, we have a very special bond.  It is hard to describe.  He is my emotional child.  Our hearts are linked by some udescribable force.  Please Andy, find your light again so that you can find the path all the while being in the darkness.   Don't toss aside your principles you have come to embrace that have given you comfort in the storm.  Please Andy, don't forsake God's grace and guidance.