Kids can be extremely manipulative about how good they behave while they're out with their friends, in front of their parents. When daddy's perfect angel is passed out in someone's front yard and overdosing on a night she stayed out and didn't answer her phone, it's could be a good idea to drive by to see if she's dead. I've seen it my whole life, I'm a DJ. Don't be naive and let it happen inadvertently, searously.