Write an addendum explaining that you didn't get an F because of misconduct. If it's unexplained, they'll either ask you to write something explaining it or they'll just suspect the worst. If you did get an F because of misconduct, you might as well save the adcomms the trouble of shoving a fist up somewhere unpleasant and apply a tier down from where your numbers put you. Maybe two. Start thinking of good excuses for your C&F.
Adcomms have also seen even more people not check the box because they thought that they could get away with it. Adcomms also know that 95% of professors never give F's unless you really deserve it. Write the addendum saying why you got the F and specifically say that it was not due to academic misconduct. Getting in to law school isn't about framing bad things as politely as possible, it's about disclosing fully every skeleton you have.