"In another revision, unruly behaviour, or behaviour which risks injury (such as diving), will be deemed in breach of the promotion's terms and conditions, therefore disqualifying contestants in the event of a successful catch.
"Usual standards of behaviour applying to all venues will apply.
"Communications at venues will be amplified, in terms of both ground announcements and on-location personnel, so that those patrons involved in the promotion are regularly reminded of their responsibilities and acceptable behaviour.
"The only variation to these new measures will be at Eden Park and Westpac Stadium, where "catch zones" will not be incorporated. However, all other amendments surrounding behaviour to the competition rules will apply to these venues."
The competition offers up to $50,000 to a spectator in the specialised shirt who cleanly catches a six with one hand.
It's a popular promotion which sees a vast number of spectators take part in the hope of cataching a fortune.