Domenic Perre, the key suspect in the 1994 bombing of the National Crime Authority office in Adelaide, has been denied bail on drug and firearms charges.
Perre came before Adelaide Magistrates Court on Wednesday with his lawyers asking for him to be released on home detention bail.
But magistrate Jayanthi McGrath ruled that no bail was appropriate for the 60-year-old because of the seriousness of the alleged offending and the risk of him reoffending.
Perre has been charged with cultivating and trafficking a controlled plant, possessing prescribed equipment and possessing a firearm without a licence.
Defence counsel Lindy Powell QC asked for home detention bail, arguing Perre was a "much more mature man now" and had strong ties to keep him in South Australia.
But prosecutor Emma Roper said Perre was considered a flight risk and there was also a risk of further offending.
More details to support her opposition to bail were presented but were suppressed.
Perre will return to court on August 22 when prosecutors will hand over witness statements in the case.
He was previously arrested and charged over the bombing of the NCA office in Adelaide in 1994, which killed Detective Sergeant Geoffrey Bowen and injured lawyer Peter Wallis, but the charges were dropped because of a lack of evidence.