Honestly, and this might sound like a cop out… But I don’t get involved to that extreme in anyone else’s business unless it reflects negatively on me, or screws with me, or my life in some way.
The cops don’t do anything but take bad situations and make them worse. Telling someone’s family doesn’t ever stop the person from doing whatever they are going to do anyway. People have to go through what they do and it might best serve them if you were a friend, instead of a narc if they aren’t trying to mess up your life in any way, force drugs on you, steal from you, or risk getting you into trouble… And even still, your choice to walk away when all of the information you need is right there in lieu of the potential risk to you is an option that would remove you and hurt no one by your actions.
I believe that people have to live their own damn lives and make their own choices, getting the law involved will just make them hate you if they weren’t hurting you.
Seriously, it’s useless and a waste of time.
If you can’t influence your own friends in a positive way… Maybe you should just get new friends instead?
People are going to do what they feel they need to do, we all like to believe we influence others in positive ways, mostly we don’t, but if that’s the way you want to go… I can assure you the chances are slim that it will change or prove anything and statistically it may make it all worse?
Prison doesn’t rehabilitate people… it turns minor infractions into jail time which turns otherwise okay people into animals.