This document discusses keys to officiating illegal screens in basketball. It outlines principles such as the screener must be stationary within their own vertical plane and cannot initiate contact. It then analyzes three plays showing illegal screens where the screener was outside their plane, made contact, or used their elbows/forearms to shove the defender. It emphasizes that officials must understand screening principles, anticipate screens, maintain good angles, and have awareness of all players to properly officiate screens.

1. Illegal Screens

2. Keys to officiating screens
• Screener must be within own vertical plane
• Screener may face any direction
• Screener must be stationary, except when
moving in same path and direction
• Screener cannot initiate contact
• Time and distance are relevant

3. Play #1

4. Insert play 1

5. Keys to the play
• T needs to identify a screen is coming
• Defense goes “under” screen
• Screener maintains contact with defender

6. Insert play 1 slow-mo

7. Play #2

8. Insert play 2

9. Keys to the play
• T moved into a stacked position
• Blue sets a screen outside his vertical plane
• Illegal contact by screener

10. Insert play 2 slow-mo

11. Play #3

12. Insert play 3

13. Keys to the play
• L picks up the ball on wing in primary
• L stays with the ball as it leaves primary
• Screen is set with elbows up, gives forearm
shove to defense

14. Insert play 3 slow-mo

15. More Plays

16. Insert more plays

17. Screen #5 Slo Mo

18. More keys to officiating screens
• Officials need to understand screening
principles
• Anticipate that screens are coming
• Officials need to have awareness of players
looking to get involved in the play
• Maintain good angles
• Off ball official can extend their secondary
responsibilities as needed.