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There are better ways to detect whether the finger is still attached to a live person.

https://www.newscientist.com/article/mg21128225-100-fingerpr...

Nevertheless it probably won't ever be completely reliable short of installing a hypodermic needle with the sensor to take a blood sample every time :)

Was it GATTACA where the main character used a prosthetic thumb add-on to fool the blood check every day on his way in to work?

Yep, fake hair samples and fake blood patches under the skin. There was a lot of detail written into that movie.

Andrew Niccol is so good!

And Demolition Man where he used an eyeball on a pen to fool the optical scanner.

I changed it... illuminate... deluminate...

Well this escalated quickly.

Yes, but only for a while.