Boston Children’s Hospital will not have to comply with a subpoena from the Justice Department demanding “an astonishing array” of information about its policies on gender-affirming care for young transgender patients, a federal judge ruled Tuesday.

US District Judge Myong J. Joun granted the hospital’s motion to “quash,” or set aside, the subpoena and dismiss the case, according to a copy of the decision.

Joun cited patient privacy concerns and a “bad faith” premise of the government’s request, which included personnel files and patients’ medical records, the decision said.

“BCH has demonstrated that the subpoena was issued for an improper purpose, motivated only by bad faith,” Joun wrote in a 12-page memorandum of decision.

A spokesperson for the Justice Department reiterated Attorne

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