okay, I'm gonna get it on here for answering you this way but there is no reason why at 14 you don't know where he is every second of every day. NYC is different than were I live however, not that different. 65 days is a very long time. even subtracting the 14 for the illness we are talking about 51 days, average school day is 7 hours, that is 357 hours that you have no idea where your son was? Question: Where did he tell you he was? I would have him tested for drugs, seriously. He needs to be seen by someone, you are obviously losing him way to early. When he returned to school or before going back you should have met with teachers to establish a plan. No sense in harping on you at this point. Every consequence you stated is possible. Here's the deal on the school absence: yes as long as a child is a minor you are responsible for everything they do and don't do. That includes not attending school. I've attached a website that can help you. Truancy is defined by 5 unexcused absence in most states.
Truancy: Encyclopedia of Everyday Law