I really really would appreciate your help on this matter!

My father was arrested about a year ago for possession of drugs but the judge sentenced him to probation. He attended all his classes and gave drug tests that were all required in his probation. He has hep C and he became so ill he left the country to get treated and just came back to US. He was gone for about 10 months and they arrested him under a warrant as soon as he came here. He violated his probation because he did not fully complete his probation sentence. We have all the paperwork from his treatment from the other country so I was just wondering what you think the chances are that the judge won't sentence him to jail time. Yes he didn't get permission to leave the country and violated his probation, but he completed some of it, didn't commit any other criminal activity, and has doctor paperwork to prove that he was getting emergency treatment.