Tucson residents who were evacuated Tuesday are still waiting for the go-ahead to return home after a crash on the freeway left one dead, resulting in liquid nitric acid spilling onto the road and surrounding area. Yesterday, at approximately 2:43 p.m., a collision involving a commercial truck-tractor hauling a box trailer rolled over, leaking liquid nitric acid on Interstate 10 eastbound between Rita and Kolb roads, according to the Arizona Department of Public Safety. This morning, Unified Com