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An MCG spokeswoman said the MCG worked with "Cricket Australia, Victoria Police and the security contractor to ensure policies are in place to allow patrons to enjoy events in a safe and inclusive environment."
"…there have been a handful of patrons who have displayed inappropriate behaviour.
"The Cricket Australia ticket and entry conditions for 2019/20 outline that a person who is in possession of a valid event ticket and is considered to be affected by the consumption of alcohol or drugs in any way may be refused entry to, or evicted from, the MCG."
Witnesses have been keen to defend Barrett, who they say was red carded for simply sculling half a beer, and that his behaviour was in no way disruptive.
"Jordie and his mates were doing what a lot had been doing and they didn't get kicked out, they were just having a bit of fun, said Heath Moore, an NZME journalist.
"His mates were yelling 'scull, scull, scull', he knocked back one drink and then sat back down. Security immediately rushed to kick him out and he didn't make a scene at all, just left calmly."