I would guess that the system does what it is supposed to do perfectly: it evaluates a person's state of mind at that instant of time, and determines 100% accurately whether said person will or will not commit a crime.
The flaw would be that it assumes no major third-party stimulus. It couldn't have predicted that Akane is capable of placating the woman right then and there. Its job is just to unlock the trigger; predicting future influences would be another technological leap all together. Rather, it's the enforcer's job to determine whether a person is beyond saving. Unfortunately, the enforcers in this era don't seem very nice.
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