Cartan was caught up in London 2012 ticket exposé
THE US company caught up in the ticket-touting scandal was previously investigated by London 2012 organisers examining illegal ticket sales.
Police in Brazil have produced emails which show that OCI chief Pat Hickey held a relationship with Greg Harney - a director of Cartan.
Cartan was previously embroiled in a London 2012 ticketing controversy - but the company has denied any wrongdoing in Rio.
The International Olympic Committee (IOC) launched an investigation in June 2012 into black market ticket sales. It was also reported at the time that Greg Harney's company Cartan told undercover reporters how to conceal an illegal ticket sale.
A UK tabloid claimed a reporter was able to buy tickets which should have been sold to New Zealanders.
The IOC released a statement at the time saying it was taking the "allegations very seriously" and "immediately" took the "first steps to investigate".
In December 2012, the IOC said an ethics investigation found that some resellers "broke rules" by selling tickets outside their jurisdiction. The IOC did not name any resellers.
Now it has emerged that Cartan is allegedly involved in the Rio ticket scandal.
Documents presented by police in Rio appear to show Marcus Evans, the owner of THG, was passed tickets by Cartan that seemingly originated from Olympic allocations of several countries.
Although Cartan was allowed to resell Rio 2016 tickets for 36 different countries, police say the company was not allowed to give tickets to another agency.
In a statement to the Irish Independent, Cartan described the allegations of illicit conduct as "baseless" and denied any involvement in "ticket schemes".
The company confirmed it did sell tickets to THG Sports, claiming this was allowed as THG "resides in an EEA member state" and the tickets were "purchased from EEA member states inventories".
Carton said that such sales were "expressly provided for by the IOC" and Rio ticketing sales agreement.