SAN FRANCISCO—Seventy-one California police agencies in 22 counties must immediately stop sharing automated license plate reader (ALPR) data with law enforcement agencies in other states because it violates California law and could enable prosecution of abortion seekers and providers elsewhere, three civil liberties groups demanded Thursday in letters to those agencies.

The letters from the Electronic Frontier Foundation (EFF), the American Civil Liberties Union of Northern California (ACLU NorCal), and the American Civil Liberties Union of Southern California (ACLU SoCal) gave the agencies a deadline of June 15 to comply and respond. A months-long EFF investigation involving hundreds of public records requests uncovered that many California police departments share records containing detailed driving profiles of local residents with out-of-state agencies.

ALPR camera systems collect and store location information about drivers, including dates, times, and locations. This sensitive information can reveal where individuals work, live, associate, worship—or seek reproductive health services and other medical care.

“ALPRs invade people’s privacy and violate the rights of entire communities, as they often are deployed in poor and historically overpoliced areas regardless of crime rates,” said EFF Staff Attorney Jennifer Pinsof. “Sharing ALPR data with law enforcement in states that criminalize abortion undermines California’s extensive efforts to protect reproductive health privacy.”