My son has been with his girlfriend for over 5 days and I cannot get ahold of him

He's 17 and missed 3 days of school being with her. I'm not sure what to do, her parents clain they are "ok" but he won't answer me.What should I do about this? This is obsessive behavior and it's not healthy. I can't tell him to get his ass home because he's not answering me.Would the cops be good at this point or is that too far?Update: He's at the girl's house, the parents know and are supporting their decisions and since her father is on the school board, he is not going to allow him to get in trouble with the school.So basically he's losing his education and her parents are supporting it. via /r/Parenting http://ift.tt/2gWlK2j