There is a bug that was recently discovered that allows Outlaw (and Assassination) Rogues to apply the Find Weakness (Subtlety) debuff for a full 18s by using Echoing Reprimand from Stealth or Vanish.
If this comes up in logs, they should probably be “exploit” flagged (even if not intentional) for the purposes of personal rankings as this is a rather significant DPS increase for Outlaw and it would be extremely hard to compete with logs that utilize this behavior.