Seventeen people have been charged as a result of the three-month investigation.

The drugs were smuggled in through a variety of methods – some in soft drink cans and tennis balls thrown over the prison walls; some in packages shot in on arrows; and in Sony Playstations.

All up, police seized 12 grams of heroin, 15 grams of speed, plus marijuana and prescription drugs such as morphine and Xanax.

Detective Senior Sergeant Darren Fielke said mobile phones were smuggled into the prison and used to organise the drug ring,

“Outside work gangs at the prison were used to collect the contraband that was delivered to pre-arranged locations outside prison,” Sgt Fielke said.

“Shutting this syndicate has put a severe dent in drugs inside the prison.

“Some of these methods are sophisticated for the environment they are in (but) prisoners will continue to come up with methods to defeat the system.”

The outside work gang program at the prison has been suspended.