A second sample from former world number one show jumper Rodrigo Pessoa’s horse Rufus has tested positive for the banned substance Nonivamide.

Vets at the Hong Kong Racing Laboratory carried out tests on Tuesday (2 September) on a second sample from Rufus following a positive result of an initial sample on 23 August, following the Olympic Games.

Both samples have tested positive for the prohibited substance, a member of the capsaicinoid family.

Mr Pessoa is the fifth show jumper and sixth rider overall to allegedly fall foul of International Equestrian Federation (FEI) rules on doping at the Olympics.

A date for the hearing with a panel of the FEI Tribunal will be announced soon, said an FEI spokesman.