A former tattoo artist says he was knocked unconscious and had his teeth broken while being arrested by a Gold Coast police officer who is accused of using excessive force on a number of people.

Key points: Gold Coast constable Aaron Minns charged with four counts of assault

Gold Coast constable Aaron Minns charged with four counts of assault Victim says he was knocked unconscious during arrest

Victim says he was knocked unconscious during arrest Minns starred in reality TV show Gold Coast Cops

Senior Constable Aaron Minns, who starred in Channel Ten's reality TV series Gold Coast Cops, has pleaded not guilty to four counts of common assault from incidents in 2014 and 2015.

Alex Tony Soppa said he was depositing money at a bank in Nerang in January 2015 when Constable Aaron Minns grabbed him from behind, without showing his badge, and told him he was under arrest.

"I shoved him off and then he ... grabbed me by the shirt and it ripped off," Mr Soppa told the Brisbane Magistrates Court.

Soppa ran outside, tripped and fell over a garden bed and rolled down an embankment, the court heard.

"All I remember is getting up and then getting hit by something," he told the court.

"It was all fuzzy as I came back to and they said 'stop resisting' and they kept hitting me and I was handcuffed and it was all hazy.

"And then they were calling me a piece of shit and scum dog.

"I had blood all over my face."

Soppa, who is serving time in a NSW jail, told the court via video link he was taken to hospital with broken teeth and scaring.

Under cross examination by defence barrister Steve Zillman, Soppa admitted there was a gun and drugs inside the car he travelled in to the bank.

He also admitted to using the drug ice the day before his arrest, but denied he had also thrown a punch.

Gaber 'assaulted twice' by Minns

Jozef Gaber, who is accused of several drug offences, also gave evidence about two occasions during which he was arrested by Minns.

He denied he was holding a blow torch to make glass ice pipes, when Minns approached him in the kitchen of a Gold Coast home.

"I put my hand behind me, like he [Minns] asked ... and he smashed me down on the tiles," Mr Gaber told the court.

Defence barrister Mr Zillman said the pair encountered each other again in January 2015, when police were executing a search warrant for a firearm.

Mr Zillman said Mr Gaber had disobeying police instructions, and suggested Minns had struck him with an open hand after he made threats to his family.

"No, he punched me," Mr Gaber replied.

"I don't know his family."

Minns kneed handcuffed offender

A number of police officers also provided testimony about an arrest in Mudgereeba in September 2014 of a man they suspected was carrying a gun.

A police dog tracked down and bit the offender.

Constable Steven Martin and Senior Constable Minns tried to handcuff the man.

Constable Martin told the court the offender was resisting arrest and yelling, but said he did not notice anything he considered inappropriate during the arrest.

The police dog handler, Senior Constable Joseph Nephi Alofipo, said he saw Minns knee the offender in the head while he was handcuffed.