https://en.wikipedia.org/wiki/List_of_artificial_objects_leaving_the_Solar_System

"Several space probes and the upper stages of their launch vehicles are leaving the Solar System, all of which were launched by NASA. Three of the probes, Voyager 1, Voyager 2, and New Horizons are still functioning and are regularly contacted by radio communication, while Pioneer 10 and Pioneer 11 are now defunct."

Target suggestion:

Are the space probes really out there? Because prisoners shouldn't be allowed to have them...