What Theranos claimed to be capable of is physically impossible. Cursory technical knowledge of the industry would have made it obvious.

I would supplant your comment with, "Be skeptical of the viability of products that relevant experts are skeptical of."

I don't see the link between this and Theranos, your reply feels like an unsubstantiated dismissal of this research. This is a device that measures cortisol levels in your sweat, which apparently correlates well to the levels in the blood.