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The Texans worked out cornerbacks Robert Jackson and De'Vante Harris on Monday, according to a league source not authorized to speak publicly.
Jackson is being signed to the Texans' practice squad.
Jackson was previously with the Indianapolis Colts and was released from injured reserve. He had a concussion during the preseason.
Jackson is a big, athletic corner at 6-1, 202 pounds who went undrafted out of UNLV.