Ok, My teen keeps lying to me. It started when she started seeing this old guy, which we made her (15yrs) stop seeing him (17yrs). Long story short: he smokes weed and we would rather her not associate with people like that at a young age. Then she started lying ab out having this new boyfriend but in fact the old guy was hiding in the trunk when the new guy came to pick her up. That went on for four months before we found out. Now, today I found out that she has been leaving the house in the middle of night. What is the best thing to do?

I don't understand. The old guy is l7 years old??

Ground her completely, no going out, sneaking out, alarms on the doors and windows, bars for security, drive fence posts in front of basement windows, I don't know how for do you want to go.

Sneaking out is way too far and has to be stopped, so the house can always be secured to a point she can not leave without you knowing it.