If you're building a system to proctor students, then part of your job is to get it to work under all reasonable real-world conditions you might encounter: low light, students with standard webcams or just the one built into their laptop, students with darker skin etc. Reality might make this harder for some cases, but solving that is what you are being paid for.
Also, this could have been handled much better in the cases that came up in the media if there had been proper human review of all cases before prosecuting the students.
Also, this could have been handled much better in the cases that came up in the media if there had been proper human review of all cases before prosecuting the students.