Restricted area for objects

Hi there peeps :)

Kind of stuck on a script / activity ... the 2D game I am working on has good and bad Footballs flying about where if good one $$anonymous$$ts you ... you get a point but if the bad one $$anonymous$$ts you ... you die! But I am trying to create a safezone In the game where either the ball can't enter or when it does enter the points / Destroy will be disabled.

How do I do t$$anonymous$$s?