ALLEGED murderer Vincent O'Dempsey's high-powered solicitor Terry O'Gorman has put police "on notice".
Mr O'Gorman is warning the authorities against encouraging prisoners to speak with O'Dempsey about his murder charges.
The 76-year-old Warwick man and Torbanlea man Garry Reginald Dubois, 67, face murder, deprivation of liberty and other charges in relation to a cold case from 40 years ago.
O'Dempsey was arrested at the phone box behind the Matilda servo on Saturday morning by Brisbane homicide detectives and Warwick CIB.
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O'Dempsey and Dubois appeared briefly in the Brisbane Magistrates Court yesterday.
Police believe the two men had a hand in the disappearance of Barbara McCulkin and her daughters Leanne and Vicki.
The trio disappeared from their Brisbane home on January 16, 1974.
Outside the court, the men's solicitors said O'Dempsey and Dubois would be pleading not guilty to all charges.
Mr O'Gorman warned police against encouraging prisoners to speak with O'Dempsey about his murder charges without recording the conversations.
And it was not just the police Mr O'Gorman put on notice.
He warned prison inmates against seeking to "curry favour... to hope to get advantage in parole or otherwise" with police through false allegations about his client.
"This case has the profile that calls out for a 'jail verbal' or, put differently, a false allegation from a prisoner that my client has confessed to this matter in jail," Mr O'Gorman said.
"I've also made it clear in court that if the police seek to encourage a prisoner to talk to my client, if they do so without that discussion being electronically recorded then it's on the police's head."
O'Dempsey's and Dubois' solicitors have told them not to speak with anyone, namely police or prisoners, about the charges.
The men remain in custody and will both apply for bail, but can only do so in the Supreme Court because they face murder charges.
The matters were adjourned to November 24.