NEW DELHI (AFP) World Anti-Doping Agency chief David Howman on Saturday urged greater international efforts to clamp down on people supplying drugs to athletes amid the latest scandal to rock cycling. Howman, in New Delhi for the Commonwealth Games, insisted that the war against drugs was being won and defended cycling officials for doing their best to root out cheats. But he also admitted the scourge would never be completely stamped out. His comments come as world cycling chiefs looked to resolve the doping controversy surrounding Tour de France champion Alberto Contador. Contador has been provisionally suspended by the International Cycling Union (UCI) after he announced he had tested positive for clenbuterol, a banned substance, during this years race. World cyclings ruling body said that only a very small concentration of the drug had been found and that the case warranted further scientific investigation. The Spaniard claims he was the victim of contaminated food. While not wanting to comment directly on the Contador case, Howman said: Cycling officials can only do so much in terms of their programs. They are spending a lot of money and effort to run a very thorough anti-doping program, probably in excess of other sports. But you have to have a little bit of patience. Howman said inroads had been made in testing procedures, and in trying to outsmart drug-cheats, and that it was now time to step-up efforts globally to target the suppliers. Those supplying the drugs are making a lot of money out of that, he said. There are a lot of countries in the world where it is legal to distribute steroids, legal to supply human growth hormones. So why not invest in that business and make a lot of money? We need to stop that. Worse, the money used to buy the steroids before they are distributed comes from other ill-gained sources betting, bribery and so on. And it is the same group of people who are making the money. So I think there is another step that sport can take and that is to make the link and work out what it can do about it internationally. While the Contador case was the latest in a string of high-profile doping scandals to tarnish sport, Howman remains confident that the battle to eradicate drugs is slowly being won. Are we winning the war? I think we have made a lot of progress, he said. I mean, I dont think well ever drive plagiarism out of journalism, well never make all lawyers in the world non-corrupt, and I dont think well have a situation where we have a non-cheating athlete society. Theres always going to be someone who wants to take the risk. The Commonwealth Games, featuring 71 nations of the former British Empire, get underway on Sunday. Some 1,500-2,000 drug tests are set to be carried out, pre-Games and in-competition.