Forty-nine states and DC have shield laws or court-recognized privileges protecting journalists from compelled source disclosure. The federal government does not — the Supreme Court rejected a constitutional reporter's privilege in Branzburg v. Hayes (1972).
The PRESS Act, repeatedly proposed and passed by the House but stalled in the Senate, would provide federal protection for journalists from compelled disclosure of sources, with exceptions for terrorism and imminent harm.
Defenders argue source protection is essential to investigative journalism and informing the public. Critics argue it can shield criminal activity and that "journalist" is hard to define in an era of bloggers, podcasters, and citizen journalists.