Give them Honor points.
Players were banned for intentionally feeding in every single game they were playing, using it as a way to get Honorable Opponents from their opponents.
You don't think it's suspicious when a player loses every single game he is in after Honor was launched with scores like 0-18 every single game? He was Honored by a few players but was reported so often that it flagged multiple systems and that's why he was banned.
This will flag them on multiple systems and get them banned without the need for tribunal.
Thanks for the tip Lyte.