The spit of the beast

Worried that in the future you will have your hand or forehead marked with the Mark of the Beast?

Dustbury writes the future of biometric identification is...saliva.

Fingerprinting? Too much trouble. Retinal scan? Get that thing away from my face. Here’s the, or at least a, future of Positive ID:
Humans being the way we are, some people find this amusing, some people think it’s unsanitary, gross, and offensive, some people consider anything involving DNA a violation of their privacy, but about 80% of the people are just like, “Alright, whatever.”
Which is probably enough to get the other 20 percent in line, don’t you think?

Well, I can think of a way to get someone else's DNA into your saliva, but since this is a family blog, I will refrain from the details.