Paralympic champion Oscar Pistorius has never doped, his father told the BBC after police claims - later retracted - that drugs were found at his home.
The South African athlete, 26, who denies murder after the fatal shooting of his girlfriend Reeva Steenkamp, was granted bail by a magistrate on Friday.
Magistrate Desmond Nair said officer Hilton Botha "blundered" by stating testosterone had been found.
Henke Pistorius said: "He's never been involved in that. It's ridiculous."
Oscar Pistorius, nicknamed "Blade Runner" because of his prosthetic legs, was released on bail following a four-day hearing.
He denies premeditated murder, saying he shot Ms Steenkamp thinking she was an intruder at his home.
"We are happy he has been released and never doubted that outcome, but we mourn the death of Reeva," Henke told the BBC.
Multiple Paralympic champion Pistorius became the first double amputee to run in the Olympic Games at London 2012.
His father insisted the sprinter shunned drugs and was determined to race as a clean athlete.
"He has been quite outspoken against it in the past. He wouldn't even befriend anyone involved in that," said Henke.
"He keeps his record straight - he's a serious sportsman."
Tests are being carried out on two bottles removed from Pistorius's home, which his defence team say contained a legal herbal remedy.
At the bail hearing, Detective Warrant Officer Botha had initially alleged they contained testosterone - a banned performance-enhancing drug - but later conceded it was too early to identify the substance.
The detective has since been replaced as lead officer after it emerged he faced unrelated attempted murder accusations.
Pistorius, who won two Paralympic golds and one silver, passed two drugs tests at London 2012.
The bail hearing began on Tuesday and both prosecution and defence laid out their cases.
Both sides agree that Pistorius shot through the bathroom door four times, hitting and killing Ms Steenkamp, 29.
But prosecutors allege the shooting happened after the couple had an argument at Mr Pistorius's home in the early hours of 14 February.
They sought to portray Pistorius as man with a history of violence who was likely to flee the country.
His defence team argued it would be impossible for Pistorius to flee because his prosthetic legs would be noticed wherever he went.
He is expected to stay with friends while he awaits his next court appearance on 4 June.
Ampie Louw, his running coach, has indicated he may benefit from a return to training although there are no plans to enter competition while the criminal case continues.