Can evil be scientifically quantified as to what it really is?

Yes.
It’s E=uvc2.

It can’t be quantified, it is not whatever the majority of man agrees that the abstract idea of good is. Abstract things cannot be measured.

I’m assuming it would be a thorough psychological and mental evaluation by professionals.

I’m sure it can, but it’d be such an intricate process that it would be virtually futile in actual use.

Evil is intentions based. If Intention=Negative Cause to someone, and how many times they think about it, it can be quantified.

I=NC(T) of any thought that causes harm to another or ones self. Yeah I made this up, but it makes sense. If you plan to publish it, let me know at least :D

evil don’t look like anything.

Not with our present technology, but advances are being made all the time in detection methods through genetics, microbiology, and brain scan data. Perhaps it will someday be possible.

Evil has no bearing or existence outside the human mind IMO. There isn’t an evil force flowing throughout our galaxy. Evil is a sociological phenomena.

Evil is just a subjective label societies and individuals use to define (usually, extreme) behaviors or beliefs they find intolerable. You can measure it but only in the sense of what is/was considered evil during a specific period of time.

@wonderingwhy Great answer. My sentiments exactly. Slavery and the Crusades are evil by my standards, but were considered necessary and rights in another time.