https://www.foxnews.com/politics/flynn-judge-orders-mueller-to-turn-over-fbi-docs-after-bombshell-filing-claiming-he-was-pressured-by-agents

How do you introduce evidence legally?

"Judge in Flynn case orders Mueller to turn over interview docs after bombshell claim of FBI pressure". Sullivan just ordered the original Strzok/Pientka memos on the Flynn interview and the official FBI 302 filed 7 months later, to be filed with the court.