How can I convince my 14 year old daughter to stop dating a guy who is almost 19 and does drugs?

Since September my daughter has been seeing this older guy. He smokes marjuana, drinks, has given my daughter alcohol and maybe even drugs too. On Halloween I even read text messages between them, which were like phone or cyber sex. I have tried to legally keep him away from her. However, the police say there... show more Since September my daughter has been seeing this older guy. He smokes marjuana, drinks, has given my daughter alcohol and maybe even drugs too. On Halloween I even read text messages between them, which were like phone or cyber sex. I have tried to legally keep him away from her. However, the police say there is nothing that can be done unless I know for a fact that they have had intercourse. Meaning she would have to admit to it or I would have to physically catch them "in the act". I'm so afraid for my daughter for many reasons. I'm scared she will end up taking drugs, that she will drink again, possibly end up pregnant and who knows what else.. On New Years she was arrested and taking to Juvenile Detetention for threatening to stab me. She had snuck out and began drinking with her boyfriend, when she got caught and feared her boyfriend would go to jail, she snapped. I'm so afraid of what is going to happen next. I really don't know what I can do. Any advice is appreciated
Update: I did show the police the text messages and the officer said, "really, this is typical discussion between teens.." Personally I disagree.... - I have called the police on 4 different occasions since Halloween and every single time, they say that there isn't anything they can do. - My daughter has... show more I did show the police the text messages and the officer said, "really, this is typical discussion between teens.." Personally I disagree.... - I have called the police on 4 different occasions since Halloween and every single time, they say that there isn't anything they can do. - My daughter has been grounded ever since Halloween, so for the past 3 months. However, that ends tomorrow.. As far as the alsohol goes, I didn't find out that she had been given any alcohol until 2 weeks after she was arrested. not even the police knew. So it was too late, I had no proof, plus she wouldn't tell the police ANYTHING against this guy. I also didn't let her out of the Juveinille Detention Center, they sent her home within 48 hours. She has been on home detention, decided by the court, ever since. However, this also ends tomorrow. We are going to begin counseling soon. She has already gone in for an evaluation, however when the first real session will finally be is not soon enough for me
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