Ok, I don't know what country you're in so this may not help you but...

here in the U.K. you're T would never get you arrested for it but there are some T's who wont work with you if current drug-use is an issue...same as some wont work with you if SI, alcohol is an issue. And some tell you soon as you step in the office...if things like drugs, alcohol, violence etc are an issue then they have to pass that on to the authorities if you have kids or work with kids...but I've NEVER known a T or a doc of any kind to pass it on to the cops and get you arrested just for admitting to past/present drug use if there's no safety issues concerning kids.

And I've probably been no help to you whatsoever again right?

Still....please get yourself the help you need , take care of yourself and good luck with it all.