Thank you to everyone for all of your suggestions about my difficult child who has started sneaking out of our house late at night to visit his girlfriend. I have taken all your advice, and I now have a plan on dealing with my son. I bought two alarms today at Home Depot, and we will put them on our doors in the next few days. My husband wanted the alarms that have the beeping, because he does not want to hear the shriek from the other kind of alarms. I also went to the house and talked to the girlfriend's mom tonight. I told her that my difficult child left our home very early on Sunday morning to visit her daughter. She didn't believe it at first, but then she told me that she has had trouble with an older daughter who had to go to court because she was caught by the police after the curfew. I asked the mom for help, and she promised to watch her daughter closer from now on. I also told her that if I find that my son has left our house in the middle of the night I will call their house to check on her daughter. Our difficult child does not believe that he needs to follow any rules, and he is in for a surprise when we have the alarms on our doors. He is also begging us to take driving lessons in a few months, and we told him that we will not give him permission to get his permit when he is breaking the law and our house rules about curfew. Our difficult child is not mature enough to drive, and we don't want him to get his license for a very long time. It is so helpful to know that other people have had to deal with teens being defiant. Thanks again.