This is very cool.
This could be a good addition to a polygraph. Instead of the respiration cord and pulse meter, a camera could be used. If they can measure the pulse wave velocity of the blood by how fast the blood hue crosses the face, maybe blood pressure could be estimated. That leaves only a skin inductance sensor, so the whole thing is much less invasive.
Add in a camera focused on the eye and magnifying iris movement, it's like Voigt-Kampff
(Usual scientific caveat that polygraphs are not proved to detect lies. It just seemed the obvious application to me.)