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As long as the sides are the employee's choice (i.e. the threat actor needs to not be able to know which eye is the duress one).

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And you'd want to hide the eye choosing/scanning process so nobody could just watch an employee to figure out their preference.

Scanner is something you look in with both eyes. And then while your eyes are completely hidden you close one eye.

Heck. You could set it up so that it scans both eyes and then does a second scan where you choose what your ok signal is (both eyes, right only, left only, no eyes).

Yeah i think technicaly it could work. But I actually think that is a terrible idea. Humans have a lot less self control then we think. This will lead to many false alarms.

Good point, that's a very important requirement

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