In making this argument to personal friends I have heard several times, "Well what about tow trucks? They have the right to enforce contracts on private property and they aren't officers of the law!?"

The answer is that there are existing federal statutes in place to allow this. They are controversial and often challenged. Tow truck drivers operate in a grey area of the law and are frequently found to be in violation of the law. I would hope that the BBC values their operating license more than my local tow company.