When former NSW police officer Shane Diehm went away for a weekend with colleagues it was “all about getting completely smashed”, a court has heard.

When NSW police officer Shane Diehm went to the Gold Coast in 2010 for a weekend away with some colleagues, it wasn’t to have “a cup of tea”.

“It was all about getting completely smashed,” his barrister Tim Watts told Downing Centre Local Court on Wednesday.

So when the former detective was hauled before the Police Integrity Commission (PIC) in October 2011 to answer questions about the bender his memory failed him on some points, Mr Watts said.

Initially, the 49-year-old denied taking drugs at the Queensland holiday spot.

But after a two-hour adjournment, Diehm came back and told the PIC that he had lied.

He had eaten hash cookies and taken a pill, he admitted.

But Diehm denies lying to the PIC when he said he “didn’t remember” seeing other former and serving cops use drugs that October 2010 weekend.

Diehm faces four counts of knowingly giving false or misleading information to the PIC in relation to the jaunt.

He has pleaded guilty to initially lying in the answers he gave about his own drug use but not guilty to two counts of knowingly giving false information about his colleague’s alleged consumption of illicit substances.

Diehm told Downing Centre Local Court on Wednesday he had “no reason” to protect the other police.

“I’m not naive enough to believe that I was the only one who (took drugs)… But I have no recollection,” he said.

When investigators discovered Diehm and other serving and former officers were planning a “boys’ trip” away, they set up hidden cameras in the hotel rooms.

In footage played to court, one of the men can be heard saying, “My eyes are like pinholes so something must be happening”.

After showing Diehm the footage and his continuing to say he did not remember seeing his colleagues take drugs, prosecutor Christian Hearn questioned his memory loss.

“He had a very strong memory of his drug use … it’s therefore illogical that he could have completely forgotten what the other people were doing,” Mr Hearn said.

But Mr Watts submitted that Diehm was highly intoxicated and that memory can be “unusual”.

“This was hardly a polite get together … he consumed alcohol, hash cookies and a pill which is said to be ecstasy.”

When Diehm fronted the PIC in October 2011 he had been suspended from duty for testing positive for cocaine after a colleague’s retirement party that August.

Diehm, who served at Tweed Heads, cried in court as he described that time in his life.

“My life was on a spiral … my son wouldn’t talk to me … I had no future (in the force).”

A decision will be handed down at a later date.