Police behavior

[lo-ka-hi]

…and hire a lawyer…, that's not what my post is about. It's about asking why the police would turn and then sit idling close to the house in a private driveway around midnight instead of driving back onto the road to do their idling there because it's not all that respectful methinks. I thought that maybe others have had similar experiences that made them wonder too what kind of courtesy rules the police goes by.
For example there are countries where police officers are required to take their sunglasses of when talking to a citizen which does not seem to apply here.