Drug testers have swooped on the homes of several Formula 1 drivers, including Australia's Daniel Ricciardo, in surprise early morning test.
Ferrari's dual world champion Fernando Alonso said the testers, from the World Anti-Doping Agency (WADA), arrived at his house at 6.42am on Tuesday.
New McLaren driver Sergio Perez confirmed he had endured a very early morning wake-up call as the result of a surprise urine test.
And Toro Rosso racer Ricciardo tweeted that he "Got drug tested early hours this morning."
Read more: Surprise drug test for F1 stars | Fox Sports
Racing drivers have not been implicated in the recent Australian Crime Commission's investigation into drugs and corruption in sport but CAMS will review its approach to anti-doping, illicit drugs and also race fixing and corruption.
Read more: Surprise drug test for F1 stars | Fox Sports