Le Journal de Montreal reporter Eric-Yvan Lemay, who has not been charged, was with his pregnant wife and two young children when police banged on the door at 6:45 a.m. to serve a search warrant.
The newspaper's managing editor, George Kalogerakis, says police demanded Lemay's fingerprints, some clothes and his computer.
Kalogerakis says the seized material was sealed until Le Journal contests the warrant in court.
Kalogerakis said Lemay had recently done a series of articles on how easy it was to get medical information in about 10 hospitals, including one in St-Hyacinthe where he found a stack of medical records in a corridor.
He says one of the hospitals reportedly filed a criminal complaint against Lemay.