School using finger scanning for lunches

I use my fingerprint to sign into my phone and never thought much about it, but now my school wants to using finger scanning for lunch identification and I'm not sure about it.

Here is the security policy:

Dining does not use fingerprinting, we use finger scanning—a measure of the static electricity signature as the person touches the scanner. The finger scan signature is encrypted and only valid with our specific scanning devices. The hash signatures are stored in our …

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