"Our information is that he is connected to the Hells Angels motorcycle gang, namely as a sergeant-at-arms," Ms Grealy said.
Ms Grealy opposed bail and told judge Tanya Fong Lim the amount of methamphetamine found was five times the trafficable quantity.
In response, Mr O'Shea's lawyer Peter Maley said whether or not his client was a member of an outlaw motorcycle gang was irrelevant.
O'Shea a carer for three-year-old, says lawyer
Mr Maley applied for bail and said his client was the carer for a three-year-old child and was living at home with his parents.
"He is a social user of methamphetamine and he's a carer of a three-year-old child?" Judge Fong Lim asked Mr Maley."Your honour, that is not uncommon," Mr Maley replied.
Mr Maley told the court Mr O'Shea intended to plead guilty to the drug charge, but contest a presumption that he was supplying methamphetamine. He said Mr O'Shea would wait to see vision from a police body cam before deciding whether to contest the assault charge.
"There are some matters we'll seek to complain about at a later stage in terms of the nature of the arrest and the manner in which he was apprehended," Mr Maley said.Mr O'Shea has been refused bail and will appear in court again in November. His arrest was one of several made on Tuesday, which police said targeted outlaw motorcycle gang members and their associates across Darwin.
Mr O'Shea's girlfriend Skylie Monck, 29, also appeared in court charged with minor drug offences and was granted bail.
Couple fined after drugs found in Darwin casino hotel room
On the same day a second man, who police believe is a member of the Gold Goast Hells Angels chapter, was convicted and fined for drug possession in a hotel room at a Darwin casino.
Samuel King, 42, pleaded guilty to possessing 0.5 grams of cocaine, a broken ice pipe and some gamma-Butyrolactone, also known as GBL or "fantasy".
"They decided to go to the casino for a flutter," King's lawyer Shane McMaster said.
Photo: Samuel King and his fiancee Nicki Napier both received fines for minor drug offences. (ABC News: Felicity James)
Mr McMaster said the drugs were purchased with winnings from the casino.
"He has used recreational drugs before, that was the basis for his possession."
The judge said he accepted the drugs were purchased for recreational use by King and his fiancee Nicki Napier, 29, while they visited Darwin. King was convicted and fined a total of $2,650, while Napier received a lesser fine.
After leaving court, the pair were pulled over by police who suspected their driver was unlicensed.
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