higher than 0% can cause lost grades.

I still lose marks.

Is this actual policy or are you just trying to make sure your AI usage can’t be detected?

Because there is no reliable way to detect AI usage except for obvious styling, prompt traps, and just matching your comprehension with the material (grades on assignments vs closed notes test).

I’ve never heard of any university using such a system and would bring this up to administration with other students if they ever used such an unreliable grading method.