Professional boxer and model Lauryn Eagle claims prescription medication, not illegal drugs, were the reason she failed a roadside drug test while driving in Sydney.
The 29-year-old tested positive on Wednesday morning after being stopped for a random drug test in Peakhurst, a NSW Police spokeswoman told AAP.
Eagle was arrested and taken to Kogarah Police Station to undergo a second test and banned from driving for 24 hours before being released without charge.
Results from the second test are expected in a few weeks.
Eagle has denied using illegal drugs and says she's been taking prescription medication for narcolepsy and ADHD.
"The allegation of my being on illicit drugs is heartbreaking," she told the Nine Network on Friday from the US.
"It chips away at you little by little. I'm not a weak person, I'm a very strong person. But time and time again things get twisted."
Her lawyer, Adam Houda, rejected she'd driven on illicit drugs and criticised media reports suggesting she had.
"Shameful conduct ... to smear my client with illicit drug allegations in full knowledge of her innocence," Mr Houda tweeted on Friday.
Eagle in 2012 had a conviction for driving while suspended and giving a false name to police quashed by a Sydney court.