MO HB858

Creates a "shield law" protecting journalists and media entities from being compelled to reveal confidential sources or unpublished information in federal or state criminal, civil, or administrative proceedings

Defines "covered person" broadly to include publishers of newspapers, books, magazines, and periodicals; radio/television broadcasters; cable and satellite operators; news agencies and wire services; and their employees, contractors, and affiliates engaged in news gathering

Protects both the identity of sources and unpublished materials including notes, photographs, tapes, film, and outtakes, regardless of whether related information has been publicly disseminated

Allows parties seeking disclosure to petition circuit court for divestiture of the privilege, requiring them to demonstrate the information's relevance, necessity, and that all other sources have been exhausted

Courts may order disclosure only upon written finding that the information doesn't involve matters required to be secret under law and that disclosure is essential to protect the public interest; privilege remains in effect during appeals