The American Civil Liberties Union on Thursday filed suit in Cook County against Clearview AI, a New York-based startup that has developed a controversial facial recognition tool that allows users to compare an image against a database of billions of photos lifted from the internet.

The lawsuit against Clearview — which has provided its program to various public and private entities, including the Chicago Police Department — alleges the company continues to violate the Illinois Biometric Information Privacy Act, which protects residents’ facial and fingerprint identifiers.