From Mother Jones:

The State Department has had to rely upon Clinton and her aides to ensure it now has a complete record of her emails. Last October, the department asked secretaries of state going back to Madeleine Albright if any possessed material that should be within the agency’s records system. Within weeks, Clinton handed in those 55,000 pages of email. Her team cites this as an act of transparency on her part. But one need not be a conspiracy theorist to note that there’s no telling if she and her aides hung on to certain emails they did not want to share. In law enforcement parlance, the chain of custody has been tainted.

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