Mark McGwire, Nick Amendolagine, Conrad Meil

Mark McGwire, Nick Amendolagine, Conrad Meil

In this Tuesday, Aug. 13, 2013 picture, Maryland State Police instructor Mark McGwire, center, prepares Officer Nick Amendolagine, left, of the Salisbury, Md., Police Department, and Lt. Conrad Meil of the Centreville, Md., Police Department, for an active shooter drill in a college classroom in Salisbury, Md., as part of an FBI program that teaches local law enforcement best practices for responding to mass shootings. The goal is to promote a standardized strategy as multiple local police departments -- invariably the first officers at any scene -- respond to the same shooting. (AP Photo/Patrick Semansky)

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