Hugh,
This is very good information, but if I, as a police officer or a designated reporter (nurses, doctors, teachers, and the like), found someone with lots of observations and detailed notes and maps about the movement of children, I would be considering whether to assert control for some questioning, since some parents are legally restrained from contacting (kidnapping) the children – male and female, and this is exactly what a predator pedophile needs.
The absentee parent is in an awkward position, and God help them if there is conflict of any sort. A casual comment of frustration can tip the questioning to controlling. – A.L.