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Mountain Ridge High School football practices without pads. Aiming to reduce concussions, the Arizona Interscholastic Association allows teams to use only one-third of practice time for live contact during the regular season. (Cronkite News Service Photo by Chris Cole)

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New rule limits contact during high school football practices

GLENDALE - With the late afternoon sun beating down, Mountain Ridge High School's varsity quarterback lined up under center to run plays. Receivers sharpened their routes and cornerbacks honed their man-to-man coverage.