Most adults would no longer have to wear helmets when they hop onto a motorcycle under a bill receiving final approval in the House. The bill would lift the requirement that Missourians 21-years-old and older wear motorcycle helmets. Those under 21 would still be required to wear them. Opponents predict fatalities and severe injuries will increase if the repeal becomes law. Supporters dismiss such dire forecasts and argue that the government has no right to tell an adult he has to wear a helmet. The bill now moves to the Senate.