AshleyLee,
You absolutely can get a court order. My son is 22. Last year, I had him Marchman Acted. This is the same thing as a Baker Act, but for drug/alcohol problems. You can get the package at your local courthouse. Have other family members or friends who can testify to the addicts behavior, write letters to the judge. Fill out the forms and attach the letters to the package, file with the court. They will set a hearing for the addict to go in front of the judge. You will be there as well as anyone else who wants to testify that the addict needs help. The judge will court order the addict into a rehab program. If the addict leaves, he/she will be arrested.
But with all of that, I agree that if the addict is not ready to stop, this is all moot. My son did great in the rehab, but the minute he got out, he scored. He told me he was not ready to quit at the time. He is now putting himself in rehab because he tells me now he is ready.
Good luck