In her interview with agents, Mills detailed the process by which she and lawyer Heather Samuelson sifted through Clinton’s emails to determine which were personal and which were work-related. Mills and Samuelson searched through Clinton’s emails for dot-gov email addresses, relevant keywords and the names of government officials, according to her interview.

Wait, wouldn't giving them a list of 'key words' related to classified information... constitute classified information?

The review took several months at Mills’s Chevy Chase, Md., office. Samuelson used her own computer and when she was unsure of how to proceed, she would print the email in question and ask for advice from Mills. Emails that included a mix of work-related and personal content were treated as work-related, Mills said.

So they were allowed access to classified/sensitive information on their private machines and even printed out the emails, doesn't that seem sketchy?

Investigators probed the laptops Mills and Samuelson used to conduct the review, and the DOJ offered both a narrow immunity deal protecting them from prosecution for anything found on the devices, House lawmakers revealed Friday morning.

I guess they were concerned about that too.