Start requiring video recording devices to to add EXIF style data to a video file. It should at least give enough of a fingerprint to let people know if video has been transposed, or modified in an unusually way from the devices profile.
That's why if you are doing serious plumbing you go by pipe schedule, not just the pipe size. 1" of schedule whatever pipe is not going to have the same internal dimensions of 1" other schedule pipe, but they will both thread into a 1" elbow for example.
It wasn't that way since day one, however it was not long after they were introduced that they were. They used to be ejected, but it caused weight balance issues (on top of the already existing one from the massive GAU-8), so they changed out the magazine style.
I work for a school myself as an IT director. Before you get too far into making a custom filter you need to familiarize yourself with CIPA (Children's Internet Protection Act). If you are working at a school receiving public money you have to follow CIPA to a "T" or your school may lose its E-rate funding which is likely paying for the internet access in the first place.
I keep getting cold calls at my office from EMC. About once a week the same representative calls wanting to know what EMC can do for us. Despite my telling her that she called me the week before and the answer is the same, she then claims she only got the account a few days ago... right. I'd imagine EMC needed Dell more than some people think.
No prairie dogs, but there are whistle-pigs (ground squirrels).
When I used to live in Mountain Home (the A.F.B.) there used to be a joke that there was a "pretty girl behind every tree"... that area is a desert, no trees.