Upon completion, the three specific variations in stool tagging techniques will be compared on homogenous density of tagging and patient acceptability to determine which protocol optimizes the trade-off. Diagnostic performance of CT and colonoscopy will be compared to the enhanced reference standard of colonoscopy aided by the segmental unblinding of CT results. Most significantly, these results may help determine an optimal tagging protocol to use for larger trials of CT Colonography implementation in community settings.