I'm usually all for freedom, but I'm not sure I have an issue with these. I agree that they should alert the subject immediately if it detects alcohol so they can have a urine test and clear their name, if need be, but in general I don't have a problem with the idea of monitoring those on parole for drunk driving or drunken violence. Some people just shouldn't be drinking, and if they don't have the self control to prevent themselves becoming a danger to others, then something like this seems like a better answer than locking them up.