How the umpire checks it
- Did the ball pitch in line with the stumps or on the off side, not outside leg stump?
- Did it hit the batter in line with the stumps, or outside off when no real shot was offered?
- If the batter played a genuine shot, impact outside off can still matter. Impact outside leg cannot be out LBW.
- Would the ball have gone on to hit the stumps?
- If all the needed parts are satisfied, the batter is out LBW.