Mr Turner, 22 of Gagebrook, was killed near Colebrook Road at Richmond on April 14.

His alleged killer, Shannon James Duffy, 30, pleaded not guilty to the murder and will appear in the Supreme Court in July.

A white station wagon believed to be related to the investigation was towed from a Moonah property on Wednesday morning.

Members of the Southern Drug Investigation Services, supported by general and specialist police, simultaneously executed a number of search warrants at addresses in the South.

One of these premises was fortified, police said.

As a result of entry to one of the properties, a man received an injury to the buttocks and is receiving medical treatment at the Royal Hobart Hospital.

Police said Wednesday's searches relate to an extensive investigation, code-named Operation Gold, targeting the organised trafficking or crystal methamphetamine, cannabis and firearms in Tasmania.

Operation Gold has resulted in the recovery of three firearms, two stolen and one homemade, the seizure of approximately $80,000 of illicit drugs and a cash totaling more than $25,000.

Police said five people were arrested during the operation.

"As a result of the investigation, and searches conducted, three men aged 34, 31 and 29 from Claremont, Bridgewater and Glenorchy respectively have been arrested and detained in custody for trafficking in a controlled substance," police said.

"A 29-year-old male associate from Bridgewater and a 22-year-old female associate from Gagebrook, have also been arrested and detained.

"These arrests and charges are in addition to a 23-year-old Glenorchy woman and a 23-year-old Gagebrook woman who have previously been charged in early April with drug trafficking in relation to this operation.

"Investigations are continuing and police expect to provide an update on seizure and charges in due course."

Detective Inspector Kate Chambers said more than 100 officers came together to address this syndicate's criminal behaviour, removing drugs and firearms from the streets.

"These serious offences don't occur in isolation and this investigation clearly demonstrates our commitment to addressing drug-related property crime and public place offences," Detective Inspector Chambers said.

"Individuals or groups to choose to fortify their premises in order to conceal their criminal activities can expect police attention."

If you have any information about drug or firearms crime in the community, you can provide this anonymously by calling Crime Stoppers on 1800 333 000 or online at crimestopperstas.com.au