School safety procedures may soon change at the lake after Missouri lawmakers gave final approval to legislation that could allow specially trained teachers and other school personnel to carry concealed weapons. Supporters say the measure would protect schools from intruders, but opponents say it could compromise safety by having firearms in classrooms. The bill sent to Democratic Gov. Jay Nixon on Friday would also lower the minimum age required to get a concealed weapons permit from 21 to 19. The house voted 111-28 in favor of the bill. It cleared the senate a day earlier.