New NFL rules designed to limit head injuries

Houston Texans defensive tackle Amobi Okoye, left, hits a tackling dummy during an NFL football training camp practice Thursday, Aug. 5, 2010, in Houston. (AP Photo/David J. Phillip)

Houston Texans defensive tackle Amobi Okoye, left, hits a tackling dummy during an NFL football training camp practice Thursday, Aug. 5, 2010, in Houston. (AP Photo/David J. Phillip)

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