Hi, my son is currently clean (I believe, how can one know for sure?) has been for 5 weeks. He's living with one of his sisters, but the entire family sees him every week or so. Sometimes he seems so "normal" but at other times several of us wonder (independently) if he's taken something as he seems agitated, loud, abnormally tired ,has over the top reactions to minor inconveniences. He's been an addict (opiates, xanax and others, I am sure) for 8 plus years-could he be clean, and still act this way?