United States Court of Appeals For the Seventh Circuit ____________________ No. 20-3202 LATRINA COTHRON, individually and on behalf of all others similarly situated, Plaintiff-Appellee,

v. WHITE CASTLE SYSTEM, INC., Defendant-Appellant. ____________________

Appeal from the United States District Court for the Northern District of Illinois, Eastern Division. No. 19 CV 00382 — John J. Tharp, Jr., Judge. ____________________

ARGUED SEPTEMBER 14, 2021 — DECIDED DECEMBER 20, 2021 ____________________

Before SYKES, Chief Judge, and EASTERBROOK and BRENNAN, Circuit Judges. SYKES, Chief Judge. Latrina Cothron works as a manager at an Illinois White Castle hamburger restaurant where she must scan her fingerprint to access the restaurant’s computer system. With each scan her fingerprint is collected and transmitted to a third-party vendor for authentication. Cothron alleges that White Castle did not obtain her written 2