Phoenix House is a "chain" of treatment facilities. You can find them in many areas of the country. So far as I know, they are above-board etc, although I'm not personally acquainted with them. Your post is the first I've heard of Building Bridges. My recollection is that regulation in Montana is not the tightest in the country, which could allow for some innovative good programs, but could also allow for less-desirable operations.
There are a number of sound things that can be done for someone with a heavy drug dependance. The options vary with the individual's age, and the chances of success vary with the individual's own interest in achieving change as well. Finally the best choice depends on the character and physical condigion of the person involved. The issue is not just one of getting rid of drugs/drug use, but also one of establishing something to take its place -- goals, and the means and incentive(s) to achieve them.
So, age, physical condition, extent and duration of drug use, school level and performance (if applicable), other/former interests, and any self-interest in getting off drugs???