Jenson Button has suggested that the World Anti-Doping Agency (WADA) is dropping the ball when it comes to Formula 1.

The F1 veteran said that he and his rivals must comply with strict protocols, but revealed that no driver he knows has been tested recently.

The Sun quotes Button as saying that his latest urine sample was taken "three or four years ago".

"I have not been tested this year," he said. "I don't know of any drivers who have been tested recently."

Button, 36, admitted that performance-enhancing drugs are probably not helpful in motor racing, unlike pure endurance sports like cycling.

Yet with F1 cars to get faster and harder to drive next year, Button says that WADA needs to get more serious.

"They used to test during the winter but random testing seems to have stopped," he said. "We used to do urine tests after the races but that stopped too."

Button finished 12th in yesterday's Mexican Grand Prix.