"Whilst it's good to trust employees that trust does need to be verified or else it can and will be abused"
Yes, but fingerprint scanners don't really address this problem. In fact, the belief that they do makes it easier to get away with spoofing them.
Also, "trust but verify" has always been an insulting nonsequitor. If you have actual trust, verification isn't necessary. If you're verifying, then you don't have trust. The two things are mutually exclusive.