Sam180 - I'm so sorry to read this. It sounds like where I was heading with my DS now 15, last year. Somehow, miraculously, things have turned around from a having a teen on the brink of being taken into care to having a teen who is but managing himself fairly well...
The thing that turned things around for us was our relationship. I fiercely fought to get my son away from his 'bad' crowd, who were involved in drugs, drink and smoking. When he was 14 things started to get really bad, and within a month he refused to go to his dad's at weekends, he stayed with me but went out with friends until late/all night drinking (I now know he took drugs), he would refuse to come home and when I threatened to report him missing, he went berserk. It was the worst year of my life, and I am still shaken. He was violent, smashed his room up, fought the police, said he wanted to be taken into care, that he wanted to die.
When I realised he really needed room to learn to be independent and that he needed me to support him and be on his side, things started to change. I know it sounds mad, but easing up on the rules and handing him the responsibility, actually worked. Depending on personality, the normal common sense way of parenting doesn't always work. A year later we have a good relationship, he knows I'm here for him, but that if he messes up it's on his shoulders (if he gets in trouble with the police, there may be nothing I can do). This makes him scared. He is no longer fighting me and my boundaries, he is out there on his own. It makes him not want to let me or himself down. He can see himself how much he has matured, and I think it makes him proud.
He talks about his future quite maturely, and this time as just messing around before he has to become a fully responsible adult.
I really hope things ease up for you and your son!! Things can turn around! 14 was definitely a completely crazy age for us. All the best 