DAS

Psychology metrics, it’s hard to come by good ones.

Much hand wringing, etc etc. Mostly by women with daddy issues and just enough intelligence to fake academic rigour.

I’ve got a test for them. Hundred percent guaranteed to identify your nut jobs.

Do a photometric measurement of the whiteness of the front of the patient’s teeth versus the back of the same teeth.

Anything greater than unity and you’ve got a potential patient. If the ratio’s over 10, lock them up.