Peter Lennan is "doing well" at the residential rehabilitation program, Balund-a, Tamworth Local Court heard last week.

Lennan was allowed to enter the Balund-a rehab program when he admitted to possession of testosterone and using an unregistered vehicle.

He is charged with participating in a criminal group and supplying drugs on an ongoing basis, and is yet to enter pleas.

Police prosecutor Sergeant Rob Baillie asked for an adjournment in the matter while he tried to obtain a statement from an officer involved.

But Lennan's defence solicitor Yvonne Phillipos was not impressed with the idea of further delays.

"There's been several orders made for this brief, in April, May, a further compliance for May 29, then June 26 to be served by July 17, then July 24 to be served August 7," she said.

"There's been numerous adjournments for this balance of brief; he is extremely frustrated with these other charges not proceeding."

The police prosecution would need a month to get statements from the officer and an expert, Sergeant Baillie said.

"It's not a case that he hasn't undertaken to get these things done, he's under the mercy of another officer who is away because of other work and leave commitments," he said.

"But he knows about it, he's in the process of trying to complete it and I'm asking for an adjournment to ensure it's done."

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Lennan was arrested at a Baker Street property in Gunnedah on February 28. Strike Force Munderrah, a covert operation by Oxley detectives, alleges Lennan was the head of the criminal group.

Magistrate Julie Soars warned it was the last chance for the brief of evidence to be served, and adjourned the matter to September.

Lennan's Balund-a bail will continue.

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