ALBURY harness racing trainer-driver Rebecca Brown has had one of her pacers stood down following a positive swab.

Harness Racing NSW (HRNSW) was advised by the Australian Racing Forensic Laboratory (ARFL) that caffeine, theophylline and theobromine were detected in a post-race urine sample of Bye Bye Sir following its win at Albury on July 13.

The B sample has been confirmed by the Racing Analytical Services LTD (RASL) in Victoria.

Acting under the provisions of Rule 183A, Bye Bye Sir can not nominate or compete in any race until the outcome of an inquiry or investigation.

Brown will face a HRNSW inquiry in Wagga on October 9.

Speaking to The Daily Advertiser yesterday, integrity manager and chief steward Reid Sanders said Brown hadn't been stood down and a level for the three drugs hasd't been determined.

"It's open for discussion, whether it's a therapeutic class three or class two and we will deal with that at the time," Sanders said.

"We haven't attempted to stand Ms Brown down."

Sanders then directed queries to the HRNSW penalties guidelines.

According to the guidelines, class two drugs carry a penalty of disqualification for no less than two years for a first offence and no less than five years for a second offence.

Class three drugs carry a penalty of disqualification for 12 months for a first offence and two years for a second offence.

Brown was disqualified for six months last year after an offence not relating to drugs.

In May last year, she pleaded guilty to knowingly allowing a disqualified person, her partner Mitch Reese, to participate within her registered training establishment.