In the latest skirmish over privacy in the cellphone age, a federal judge in Chicago has rejected a law enforcement request to force potential targets in an ongoing investigation to provide fingerprints to unlock any iPhones or other Apple devices.

The order by U.S. Magistrate Judge David Weisman concerned a request for a warrant to search a residence where investigators believed someone was using the internet to traffic images of child pornography, court records show.

The prosecution filing seeking the search warrant on the FBI‘s behalf remains under seal, but the judge’s opinion said the government requested “the authority to compel any individual who is present at the subject premises at the time of the search” to provide a fingerprint or thumbprint needed to unlock an Apple device.

Weisman, a former federal prosecutor and FBI agent, wrote in his 14-page opinion last month that the government hadn’t presented enough facts in its application that would justify such sweeping “intrusions,” including any specific information about those who might be living at the residence or their connection to the child pornography investigation.