The trail official is responsible f

The trail official is responsible for on-the-ball coverage when the ball is located in the
shaded areas (Diagram 42). The dark shaded area indicates the area of shared
responsibility with the lead official.
The primary duties for the trail official include:
1. Two- and three-point field goal attempts including judging whether time had
expired at the end of playing time for a period or extra period or a twenty-four (24)
second violation had occurred.
2. Goaltending and interference.
3. Rebounding situations, especially over-the-back situations.
4. Low post area, especially on weak side (away from the ball).
5. Fouls away from lead official.
6. Travelling violations (trail official has the best angle of vision).
7. Twenty-four (24) second clock.
Remember the principles of mechanics:
1. The trail official must always move when the ball moves.
2. Box-in, that is, keep all the players between the two (2) officials.
3. Penetrate when the ball penetrates below the free-throw line extended on a shot,
pass or dribble.
4. Look for the spaces between the players.