In 2008, Illinois passed a law that, a decade later, remains the toughest standard for biometric privacy in the nation. The Biometric Information Privacy Act imposes strict rules on how companies can collect sensitive information from a person’s body, requiring consent before obtaining data like fingerprints.

While other states have since passed similar laws, Illinois’ allows consumers to file lawsuits if they believe their rights have been violated under the law. This week, that led to the start of a major legal battle: the Illinois Supreme Court heard arguments on a challenge to the law that will decide when consumers can take action under the act.

The case centers on the mother of a…

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