In complete indifference to FBI protocol they didn't bring her in for questioning nor did they put her under oath when they interviewed her at home. The bottom line if you pay attention to why Comey didn't prosecute, he said he "felt" she didn't have ill intent. He said no prosecutor would want to prosecute the case which was an outright lie since thousands of attorneys wrote and called the Bureau saying they'd love the chance.
I don't understand why people work in D.C., it seems like you must sell your soul to the devil to play the game up there.