So the number of errors go up, according to your scenario, not the error rate as Gaard explained. That is what you are saying.
I understand that, and agree it's likely in some lines of work, but the responsibility falls on the employee making the errors. That is all I am saying.
I think they both go up. Imagine Kav's scenario where your time gets cut in half, but you still have the same amount of items to examine. Because you only have half the time more errors slip through. If its the same amount of items my error rate is going to increase.