Nemesysco's devices use a series of patented signal-processing algorithms that can differentiate between a "normal" voice and a"'stressed" voice. If emotional stress is detected, officials can determine if the passenger should be taken aside for further questioning.
The system works on the premise that all voices have a certain frequency, and any deviation of that baseline frequency can indicate stress.
I wonder. If you got kids for instance and they start getting unruly and you have to yell at them to tell them to shut up.
Oh. that's "emotional stress". Take you in for further questioning.
tsk tsk tsk.