Police have raided the stables of Darren Wier, one of Australia’s most celebrated horse trainers.
It's believed three people have been arrested in the raids, including Wier.
Wier is once of Australia's most successful trainers, his horses include Prince of Penzance won the 2015 Melbourne Cup.
The allegations revolve around training techniques, including the use of a jigger, a banned electronic device which shocks the horse to run faster.
Police have confirmed Detectives from the Sporting Integrity Intelligence Unit executed warrants at properties in the Warrnambool and Ballarat areas this morning .
Three people have been arrested including a 48-year-old Miners Rest man, a 38-year-old Yangery man and a 26-year-old Warrnambool man.
A statement confirmed they will be interviewed in relation to sporting integrity matters including obtain financial advantage by deception, engaging in conduct that corrupts or would corrupt a betting outcome of event or event contingency, use of corrupt conduct information for betting purposes, and attempt to commit indictable offence namely obtain financial advantage by deception.
A number of items including a firearm and what is believed to be a conducted energy device were also seized from the properties.