A former police officer hid evidence in his personal locker and posted photos of dead bodies on social media with his police identification number attached, a Queensland Civil and Administrative Hearing (QCAT) has heard.

The Queensland Weapons Licensing Unit banned former officer Ben Alexander Ephraim Dyball, 49, from holding a weapons licence in 2015 after he was reported as a missing person and police became concerned he was unfit to own and operate a gun.

Dyball challenged the order through QCAT, arguing he had the right to own a gun, but the ban has been upheld.

QCAT's ruling cited several concerns with Dyball's behaviour while he was a serving officer, including being fined for failing to stop a vehicle and careless driving after avoiding a random breath test and, as a result, starting a police chase near Warwick.

Several police officers who worked with Dyball in Warwick told the tribunal the former police officer was "blatantly insubordinate", removed personal diaries from the locker of the officer in charge and slept in police cars while on duty.

QCAT Member Michael Wood said Dyball also admitted to keeping police evidence.

"In terms of his behaviour whilst a police officer, Mr Dyball agreed that he failed to properly lodge evidence for use in proceedings as required by the Queensland Police Service (QPS) but, instead, kept the evidence in his own personal locker," Mr Wood said.

The decision also details disturbing behaviour following his medical retirement from the QPS in 2008, because of his battle with post-traumatic stress disorder (PTSD).

Last year, Dyball posted graphic images of dead bodies on Twitter.

"There are various entries on the Twitter account that concern weapons licensing and shows photographs of deceased persons with significant injuries, one of which is captioned with the applicant's police identification number," Mr Wood said.

Police uniforms, gun holsters seized in raid

A raid on Dyball's Southern Downs property last year, unrelated to the QCAT hearing, allegedly uncovered old police uniforms, police notebooks and concealable gun holsters.

Police-issued handcuffs and ammunition for rifles and handguns were allegedly also seized.

Dyball was charged after the raid and that case remains underway in the Warwick Magistrates Court.

Ben Dyball (C) was arrested shortly after his house was raided last year. ( ABC News: Isobel Roe )

The Weapons Licensing Unit told the tribunal Dyball failed to disclose his PTSD on applications for a gun licence, in which applicants are required to reveal a psychiatric condition.

Dyball admitted to being treated for PTSD, but argued the question did not ask if he had an illness.

He told the tribunal his PTSD "arose as a result of employment with your organisation [QPS]".

He also submitted a medical certificate, written in 2015 by the Condamine Medical Centre, supporting his desire to hold a weapons licence.

"Having read the relevant documents regarding fitness to hold a gun licence and having obtained a recent report from Warwick Mental Health Service, I believe Ben is fit to hold a gun licence," the certificate read.

QCAT Member Michael Wood said he was unimpressed with Dyball's evidence.

"The applicant has in my view, deliberately or at least recklessly answered questions in his applications for renewal of his weapons licences in an attempt to avoid any further queries relating to his mental health and alcohol," he said.