A selection of F1 drivers will be randomly drug-tested at French GP venue Magny Cours this weekend.

The sport's governing body adopted World Anti-Doping Agency standards a couple of years ago but it is believed that this weekend's tests will be the first in 2007 so far.

Motor racing is perceived as a 'clean' sport, with the last transgressions involving former Prost racer Tomas Enge for marijuana use during the F3000 season in 2002, while a GT driver was suspended earlier this year after testing positive to cocaine use.

Sources have, however, suggested that substances like 'EPO' - which is difficult to detect - are more likely to be doing the rounds.

"Our experience is that drugs are not a problem in formula one," the Spanish newspaper El Mundo quotes FIA president Max Mosley as saying.

But an unnamed driver countered: "We are all well prepared physically, but it is a certainty that EPO would improve for example our concentration levels."

Source: GMM