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HGH occurs naturally in a male's body. In order to effectively test for it, you need a starting level as a reference point. If a 35 year old man had a higher level than he did at age 25, it would be pretty clear he took it as a supplement. But since the level varies in everyone, you'd need to know what the prior level was.
That's the problem with Barry Bonds. Everyone knows in their gut he's taken HGH (how otherwise do you explain how his head grew after age 35?). A normal 40 year old man should have negligible amounts of HGH. But suppose Bonds naturally produces it at an abnormal level? Without knowing what his levels were in his younger years, you can't suspend him. You can ban a substance that a body produces naturally if it's taken as a supplement in inordinate amounts, but how do you prove it was taken as a supplement and not produced naturally by the body? You need a reference number to start with--it's not as easy as testing for steroids where a positive result is all you need.
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