An investigation by Greenville County Schools into how a man listed on the South Carolina sex offender registry was able to go on an overnight field trip to Charleston found that staff failed to perform a needed check in its registration system. That system, called Hall Pass, also failed to flag the man as a sex offender on two previous checks, the district said. The man was a parent chaperone on two trips – one day trip to Atlanta in September 2015 and on an overnight trip to Charleston on May 17. The district said it has been unable to...