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Sgt. Ed Lerma talks with officers about using their strobe flashlights to help blind a shooter in a dark room during an active shooter training exercise Tuesday, Aug. 19, 2014, at the old Lamar Elementary in Corpus Christi, Texas, Officer's with the district's police department go through active shooter simulations before each school year. (AP Photo/Corpus Christi Caller-Times, Michael Zamora) MANDATORY CREDIT; MAGS OUT; TV OUT