Just worried about my son
Following is a link to the standard conditions of probation in FL: http://www.leg.state.fl.us/statutes/index.cfm?App_mode=Display_Statute&URL=0900-0999/0948/Sections/0948.03.html
There is also the possibility that your son's judge ordered special conditions concerning alcohol but, absent that the Judge has no jurisdiction over your son's wife.
Still, your son cannot drink to excess and he cannot get arrested so if his wife's drinking effects either prong then he's gonna have a problem.
Being on probation is an alternative to incarceration. It is a gift of sorts, albeit it is given by an Indian giver who can take it back at any time (the alternative being jail). It behooves you to remember that at all times while serving your probationary period. It may help to think of your time on probation as walking on a tightrope. Stray just a little to either side, lose your concentration or balance even for a moment and you fall. However, instead of landing on the ground you land in jail or prison.
Your son might consider taking a look at my AVVO Legal Guide on surviving probation / CC in Florida. It contains a great deal of information on the subject, supplement this answer and may prove to be helpful to you (and most of the concepts apply to all States, not just FL). For your convenience a link follows:
Michael A. Haber, Esq.'s AVVO Legal Guide on Probation in Florida: What it is and how to survive it? http://www.avvo.com/legal-guides/ugc/probation-in-florida--what-it-is-and-how-to-survive-it
Wishing your son luck and hoping that I have been helpful in answering your question
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Was there a special restriction regarding alcohol?
Sounds like there is a substance abuse problem
Your son would have to refer to the rules of his probabtion given to him by his probation officer. Usually, possession of alcohol wouldn’t violate his probation unless it is specifically prohibited. Drinking alcohol to excess, however, would violate his probation.
He can always ask his probation officer about the problem. Probation doesn’t like to be surprised.
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