This law has been in and out of the press for the past year as it was pending. It is now an official law. California prosecutors who knowingly withhold or falsify evidence will now be charged with felonies and face prison time as a consequence.
Falsifying evidence is now a felony for prosecutors. In California, falsifying evidence or withholding information was previously a misdemeanor. So essentially if prosecutors “intentionally and in bad faith alter, modify or withhold” any information “knowing that it is relevant and material to the outcome of the case,” they could be punished by 16 months, two to three years in prison.
Pennsylvania is long overdue for a similar law.