TUSTIN, Calif. (8/4/09)--A suspicious white powder found in an envelope deposited at a California credit union has turned out to be drywall dust, officials said. Authorities were called to Schools First FCU at 8:15 a.m. Monday after an employee found the powder inside a deposit envelope (The Orange County Register Aug. 3). Two people exposed to the powder were isolated and checked by paramedics as a precaution. They did not experience any illness symptoms, said Sgt. Jeff Blair of the Tustuin Police Department. At 11:35 a.m. the hazardous materials crew determined the substance wasn't hazardous.