If surveillance is necessary we feel obligated to inform you of the "real life caveats." Surveillance, especially moving surveillance, is a hit and miss science. We can perform these observations under agreed upon time and location parameters but cannot promise activity on behalf of the subject. Similarly, moving surveillance carries with it inherent obstacles such as the unpredictable nature of traffic. There is no guarantee that contact with the subject can be maintained as we cannot predict traffic flow, traffic conditions, weather, or other unforeseen problems. As in number one above, we have no more authority than an ordinary citizen. This includes traffic laws. Similarly, privacy and private property laws will dictate the conduct of some surveillances.
We have no more authority than does a private citizen. We are not police officers. The training, testing, background checks, and certification process we go through in order to obtain our licenses is meant to set us apart as individuals who are committed to unbiased professionalism. As such, we are bound to rigid codes of conduct dictated by the State.