According to House Bill 266, signed on Thursday, July 11, 2019, any whiskey labeled as Missouri bourbon must not only meet the federal standards for bourbon, but also be mashed, fermented, distilled, aged, and bottled in the state; aged in oak barrels manufactured in the state; and—beginning January 1, 2020—made with corn exclusively grown in the state. The law went into effect on August 28, 2019.