First, contact your attorney and discuss this with him/her as soon as possible. When you are on probation you must comply with the terms of probation to avoid violating your probation which can result in an arrest. Did your probation officer deny your request to use the closest substance abuse center on their approved list? If so, what was the reason? If you did not speak directly to your probation officer about the issue then you and your lawyer should make an effort to speak to this...