Attorney General Eric H. Holder Jr. on Friday barred local and state police from using federal law to seize cash, cars and other property without evidence that a crime occurred.

Holder’s action represents the most sweeping check on police power to confiscate personal property since the seizures began three decades ago as part of the war on drugs.

Since 2008, thousands of local and state police agencies have made more than 55,000 seizures of cash and property worth $3 billion under a civil asset forfeiture program at the Justice Department called Equitable Sharing.

The program has enabled local and state police to make seizures and then have them “adopted” by federal agencies, which share in the proceeds. The program allowed police departments and drug task forces to keep up to 80 percent of the proceeds of the adopted seizures, with the rest going to federal agencies.

“With this new policy, effective immediately, the Justice Department is taking an important step to prohibit federal agency adoptions of state and local seizures, except for public safety reasons,” Holder said in a statement.

Holder’s decision allows some limited exceptions, including illegal firearms, ammunition, explosives and property associated with child pornography, a small fraction of the total. This would eliminate virtually all cash and vehicle seizures made by local and state police from the program.

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