The Missouri State legislature has passed a bill that, if signed, would repeal the state’s mandatory helmet regulation, thus allowing riders over the age of 21 who are traveling on city roads, to do so without a helmet. The passage of this bill is naturally divisive, with advocates of individual liberties and safety experts squarely on opposite sides of the table. Should personal liberty advocates win this debate, the bill would make Missouri 1 of 28 states with such a helmet law on the books.