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SPRINGFIELD, Ill. — The Illinois Supreme Court ruled Friday that a woman can sue Six Flags Great America for fingerprinting her child without telling her how the data would be used in violation of the state’s biometric law, which privacy advocates consider to be the nation’s strongest biometric data safeguards.

Stacy Rosenbach sued the amusement park north of Chicago in 2016, about two years after her son was electronically fingerprinted while buying a season pass. He was 14 at the time.

The lawsuit alleges the park violated the Illinois Biometric Information Privacy Act, which requires businesses and other private entities to obtain consent from people before collecting or disclosing their biometric identifiers and to securely store biometric data they do collect. It also permits people to sue businesses they believe violated the act.

In its ruling for Six Flags, an appellate court determined in 2017 that Rosenbach never demonstrated a direct injury or adverse effect, such as stolen identity or a monetary loss.

The state Supreme Court, in overturning that decision, rejected the argument that individuals should have the right to sue if no real damage occurred after they handed over their biometric information. The court ruled that a violation of the law is damage enough.

“This is no mere ‘technicality,'” as the appellate court suggested, Chief Justice Lloyd Karmeier wrote in the opinion. “The injury is real and significant.”

Biometric data, fingerprints, facial and iris scans, are increasingly used in tagging photos on social media and recording employee arrivals at the workplace.

Illinois Chamber of Commerce President and CEO Todd Maisch said in a statement the ruling will hurt employers and the state economy. The organization has said that protecting consumers’ data is important, but that the way the law is written places a burden on employers.

“We fear that today’s decision will open the floodgates for future litigation at the expense of Illinois’ commercial health,” Maisch said.

Great America spokeswoman Tess Claussen declined to comment, citing the pending litigation.

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