The NCAA definition:
A screen is legal action by any player, offensive or defensive, with or
without the ball, which, without causing contact, delays or prevents an opponent from reaching a desired position.
I think the key to an illegal screen is judging whether the screener "caused" the contact. A screen has 2 parts, the player setting the screen and the player getting screened for, who needs to rub shoulders with the screener for it to be effective. Most illegal screens occur when the wings are lazy coming off the screen causing the screener to shift at the last second and pick off the defender in an effort to do their job.
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