HOUSTON -- A 79-year-old school crossing guard was fired over a drug test, but not because he failed it, Local 2 reported Thursday. Francis Light refused to take it, violating Houston Independent School District policy. Light has been a familiar face at Oak Forest Elementary School in northwest Houston for 16 years as the school's crossing guard. He was fired last month after refusing to take a random drug-alcohol test. Light said his system is clean, and after so many loyal years on the job, he was insulted. "I got to think as long as people know me, long as...