Until, perhaps, now. Police investigating the murder of 20-year-old Gao, who the defence claims belonged to an Asian criminal gang, say they have security camera footage of Rogerson and McNamara entering a storage unit in southwestern Sydney with Gao in May last year.
Ten minutes later, the two former officers were allegedly filmed dragging a silver surfboard cover out of the lock-up and loading it into the back of a station wagon. Six days later, Gao's body was found floating off a southern Sydney beach.
According to police, officers found nearly 3kg of methamphetamine - worth millions of dollars - in McNamara's car.
They allege Gao was lured to the meeting by McNamara and Rogerson, and was carrying this amount of the drug with him at the time.
Rogerson was found to have acted in self-defence when he killed Lanfranchi in an inner-city Sydney alleyway in 1981. His conviction for murdering Drury in 1984 was overturned on appeal.
He and McNamara have pleaded not guilty to the murder charge, as well as to charges of conspiracy to murder and supplying drugs.
Rogerson worked on celebrated cases in the 1970s involving criminals such as Sydney's "Toe Cutter Gang".
After being dismissed from the force in 1986, Rogerson joined the entertainment circuit, touring a show called The Good, The Bad and The Ugly.
He also released a book, entitled The Dark Side, about his murder investigations and his time in jail.
To the frustration of NSW crime geeks, Blue Murder was not permitted to be shown in the state until 2001, because of outstanding charges against Smith.