In cybersecurity you asymptotically approach being secure, but you never reach a point where it's safe to say "there are no more vulnerabilities" With deepfake

In cybersecurity you asymptotically approach being secure, but you never reach a point where it's safe to say "there are no more vulnerabilities" With deepfakes you'll asymptotically approach indistinguishability, but there will always potentially be some lurking tell. I've seen cases where photosphopped images were identified because the shadows on the ground were incorrect for the time of day of the image's timestamp, one could imagine similarly that a pulse detector could be sensitive enough to not only detect that a pulse exists but to evaluate if the pulse is right for a person's age and body type, or even compare it to known videos of the same person under similar circumstances. Anything that didn't really happen will have to be inconsistent with what did, and that inconsistency, no matter how slight, will always be potentially detectable.