Brandon James Green pleads guilty to corruption charges after contraband smuggling investigation | Strike Force Cantrill

Brandon James Green was captured by police as he went to enter the Glen Innes Correctional Centre on July 23.

The 28-year-old's car was then searched and police uncovered more than $8000 in cash in the Nissan Pathfinder, as well as a small weight scale.

The goods were seized and Green was taken to Glen Innes police station where he was charged with two corruption offences and denied bail.

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He was refused bail in Armidale Local Court on the charges after detectives alleged he was involved in organising the trafficking of contraband into a jail in North-Western Sydney.

On Thursday, he appeared in Penrith Local Court on Thursday on two charges of corruptly giving or offering to give an agent a benefit. He pleaded guilty to both charges.

He will face sentencing in the same court in August, after magistrate Alex Mijovich formally refused him bail to stay in custody.

He's the fifth charged as part of a police sting - code-named Strike Force Cantrill - which is investigating the smuggling of contraband into a Sydney prison.

The strike force was set-up in May after allegations arose of corrupt activity by a man working for Corrective Services.

The operation - which is being spearheaded by the Corrective Services Investigation Unit (CSIU) - has seen a 37-year-old male Corrective Services truck driver charged; along with a 37-year-old male inmate.

Officers have also charged a 35-year-old woman and a 32-year-old man.

The accused all remain before the court. Police said investigations by the strike force are continuing.

The (CSIU) - which is part of the State Crime Command's Robbery and Serious Crime Squad - carries out "proactive intelligence-based investigations into criminal activities and corruption" within the state's jails, police said.