Denver Broncos safety Kareem Jackson, who was suspended four games last month for repeated violations of unnecessary roughness rules, was back on the practice field Wednesday. Coach Sean Payton said no decision had been made about whether or not Jackson would be moved to the roster before Sunday or what his role in the defense would be if he is. Safety P.J. Locke has played in all six games missed by Jackson and has started in five of them, with an interception, three sacks, and two forced fumbles.