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13th July 2016
08:20am BST

"I've been tested by the IGF or Olympic testing once this year and that was the Friday of the US Open, but it was only a urine test. I haven't been blood-tested yet. It was only a urine test."
"Yeah, I mean, I, on average, probably get tested four to five times a year, which is very little compared to the rest of the Olympic sports. Obviously I've gotten to know a lot of athletes over the years, and whether it be coming to their houses and doing blood and urine, I think drug testing in golf is still quite far behind some of the other sports."
"You can't really pick up HGH (human growth hormone) in a urine test. I could use HGH and get away with it. So I think blood testing is something that needs to happen in golf just to make sure that it is a clean sport going forward." "But, yeah, I think if golf is in the Olympics and golf wants to be seen as a mainstream sport as such, it has to get in line with the other sports that test more rigorously."
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