Okay if a teenager want to have sex/drink/do drugs, they will find a way to do it. Wouldn’t parents prefer that their kids be honest about their whereabouts as opposed to sneaking around? Parents ask for honesty but the second their child tries to have an uncomfortable conversation with them they immediately get shot down. Your kid is trying to tell you that they are going to a party and maybe if you make it clear that you won’t murder them for making mistakes you can find out where it is if you need to DD for them. Isn’t that at least better than “sleeping over at a friend’s house?” I think the best you can do is teach your kid good values and try to explain the consequences of sex, drugs, etc. The rest should really be up to them.