If it's taking images every 30 seconds, it's getting 86400 x 30 = 2.5 million images per day per camera. So when it causes enormous, unnecessary trauma to one student per week, the company can rightfully claim it has less than a 1 in 10 million false positive rate.
If it's taking images every 30 seconds, it's getting 86400 x 30 = 2.5 million images per day per camera. So when it causes enormous, unnecessary trauma to one student per week, the company can rightfully claim it has less than a 1 in 10 million false positive rate.
(* see also "how to lie with statistics").