Many years ago before I had my own strip I kept my plane at a local airfield, returning from a flight I was contfronted by a FI from the school next door who gave me a bollocking for not signing out. I asked him why he thought I was obligated to do so. He responded that if authorities ever showed up to investigate illegalities like drug smuggling he was obligated to turn over all movement records. I got the impression it was more to do with this particular guy wanting to boss people around than a legal obligation he or I had to log all my movements. I politley explaned that if I was indeed planning on doing a bit smuggling he'd be the last person I'd share my plans with. Never heard any more from him.