This is pretty much what is termed Type 1 and Type II errors in quality control.
On the one hand, if the inspection/test is not tight enough, you may allow bad units to go through.
On the other hand,if the inspection/test is tighter, you may allow actual good units to be rejected.
You cannot be 100% accurate and effective. Obviously the pendulum at this time is going to tighter inspections from a probably too loose situation previously.