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

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

The Sun newspaper in London quoted Button as saying 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.

But with F1 cars to get faster and harder to drive next year, Button said, 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."

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