Umm, I should've seen this thread before since I'm in the same situation.
I had the hostmode kernel installed, any phone with a camera isn't allowed, the teacher saw the device, I swiped the camera lens and it said Operation Failed.
Turns out fcamera isn't compatible with the hostmode kernel, so I just told them the cam's broken and got away with it.
Removing the modules should do the same, make the camera app and fcamera fail, I'll edit this post in a bit, need to check what the modules are.