It's usually case-by-case (some states or counties may have a blanket policy; I can't speak for every U.S. jurisdiction), but is a very common term of probation.Quoting nogusielkt
If he violates his probation, he could be resentenced on the original charge. If he is furnishing alcohol to a minor, he would likely face an additional criminal charge for that offense, as well as probation violation proceedings.Quoting nogusielkt
Probably nothing, unless she is somehow complicit in furnishing alcohol to a minor.Quoting nogusielkt
Most probation officers are content to pretty much stay in the office, but some do check up on their probationers. So it is possible.Quoting nogusielkt
Whomever can be shown to be in actual or constructive possession of the drugs.Quoting nogusielkt
If all of this is really a concern - that the boyfriend is going to violate his probation, serve alcohol to minors, and bring drugs into your mother's house - perhaps she should consider whether this relationship is worth pursuing.

