I'm guessing that their legal reasoning, if there's any at all, revolves around that thought that since you're handing your vehicle over to someone else's contr

I'm guessing that their legal reasoning, if there's any at all, revolves around that thought that since you're handing your vehicle over to someone else's control, that there's then no "expectation of privacy". It's a flawed argument, but I bet that's their rationale.