This from the Chicago Tribune:
Shortly after rolling out a new lunch program that allows pupils to pay for hot meals with a scan of their fingerprint, Wilmette school officials put the system on hold after learning that a new Illinois law limits the use of biometric information to protect children's privacy.
Illinois General Assembly SB1702, specifically dealing with school biometric databases, came into effect on the 1st August this year.
Adam Denenberg, the school district's director of technology and media is quoted in the article saying, "...no fingerprints are stored or could be obtained by police."
However, a child's biometric fingerprint algorithm, stored on a school database, can be accessed by police, as SB1702, section 5(B), on page 4, details:
(5) A prohibition on the sale, lease, or other disclosure of biometric information to another person or entity, unless:
(B) the disclosure is required by court order.