William Koster has pleaded not guilty to three commercial drug supply charges, as well as one count of possessing money being the proceeds of crime.
Crown prosecutor Jae Park told a jury at Downing Centre District Court on Tuesday that Koster on three occasions supplied lysergide, commonly known as LSD, to a man named James Collager, who sold the vials to an undercover police officer.
The drug deals occurred between November 2019 and February 2020, when Mr Collager picked up LSD totalling 18.9 grams from Koster to sell to the officer, Mr Park said.
The prosecution will rely on location tracking of Mr Collager's phone, which placed him in very close proximity to Koster's Campsie home on the days of the alleged drug deals.
The case against Koster will also rely on taped phone conversations involving him and others.
Defence barrister Derek Drewett in his opening submission urged the jury to remain objective and to disregard any preconceived beliefs they had about someone who worked as a DJ.
"You will learn a little more about a subculture that exists in Sydney and the outer areas, not drug subculture - I'm talking about music subculture," he said.
"I am asking that you shouldn't be prejudiced in any way if you have any thoughts about that music subculture."
Mr Drewett also urged the jury to scrutinise evidence expected from Mr Collager, whom Koster had known for at least four years.
"Look at what he is saying, the way he is saying it, but also consider why he is saying what he is saying," he said.
"Has he been offered anything to say the things he is saying in court?"
After police raided the accused's home to arrest him in March 2020, they located $7200 cash in a black tin box and a suitcase.
Prosecutors will aim to link some of that money to the payments Mr Collager received from the undercover officer to purchase the drugs allegedly obtained from Koster.
Koster's partner works in the music industry as an event organiser in a commercial relationship with Mr Collager, the jury was told.
Mr Drewett said the jury was expected to hear evidence about the nature of the business relationship and how it could explain the money found at Koster's home.
In a police interview that will be shown to the jury Koster denied he ever supplied LSD, saying he had no idea about the drugs, the court heard.
The trial is expected to hear from seven witnesses over 10 days.
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