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There are few things as revealing as a person’s search history, and police typically need a warrant on a known suspect to demand that sensitive information. But a recently unsealed court document found that investigators can request such data in reverse order by asking Google to disclose everyone who searched a keyword rather than for information on a known suspect.

In August, police arrested Michael Williams, an associate of singer and accused sex offender R. Kelly, for allegedly setting fire to a witness’ car in Florida. Investigators linked Williams to the arson, as well as witness tampering, after sending a search warrant to Google that requested information on “users who had searched the address of the residence close in time to the arson.”

The July court filing was unsealed on Tuesday. Detroit News reporter Robert Snell tweeted about the filing after it was unsealed. Court documents showed that Google provided the IP addresses of people who searched for the arson victim’s address, which investigators tied to a phone number belonging to Williams. Police then used the phone number records to pinpoint the location of Williams’ device near the arson, according to court documents. The original warrant sent to Google is still sealed, but the report provides another example of a growing trend of data requests to the search engine giant in which investigators demand data on a large group of users rather than a specific request on a single suspect. “This ‘keyword warrant’ evades the Fourth Amendment checks on police surveillance,” said Albert Fox Cahn, the executive director of the Surveillance Technology Oversight Project. “When a court authorizes a data dump of every person who searched for a specific term or address, it’s likely unconstitutional.”