Aaron Luke Unicomb fronted Narrabri Local Court on six charges on Tuesday after a raid on a home in February.

Unicomb did not enter pleas but faces charges of holder of licence not have approved storage; three counts of failing to notify police of supply, loss or theft of a firearm; and two counts of possessing an anabolic or androgenic steroidal agent.

In court, magistrate Peter Thompson adjourned the case to another court, where it will be mentioned again in May.

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The senior constable, who is based in the Western Region, was charged on March 4, two weeks after officers raided his home.

The Professional Standards Command - the squad of officers who investigates NSW Police officers - launched an investigation in February after a report about the possession of restricted substances.

Investigations led the squad to the senior constable's home on February 17, where it was raided.

During the search, police claim they found prescription medication, and allege they uncovered breaches relating to the securing and disposal of registered guns.

On Tuesday, NSW Police confirmed the officer's employment "remains under review pending the court matter".

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