Listening to every heart
Ah well, speaking from the legal end of things...if you espied the license plate, call in a report to the police and/or
go to the house and see if the car is still parked there...if it is not, and you have a friend with you, knock and explain to the occupant what you saw...
but I would personally just report it to the police if I had suspicions as to any illegal activity, as long as I had something to give them [i.e., license plate number]
~~~Keep your face to the sunshine and you cannot see the shadow.
Helen Keller ~~~