You guys all seem to assume that because he missed 3 tests that he wasn't tested at all.
His own words say he had over 22 tests in the last 2 years. In the Olympics Bolt complained that he was tested so much he was feeling faint. Coleman will be just the same due to his current ranking.
On one of his 'missed tests' he was at a different meet, and was taken to a lab and did a test voluntarily. He makes money racing. Sometimes you have to take a race on short notice, or because its ideal for prep.
Its not as simple as you think. He's traveling a lot, racing and rehabbing.
He's not like a letsrun poster, sitting in his basement hoping a phone will ring.
I doubt he's is doping. He has been running fast for a couple of years. His season progressions look normal. And he is tested out the wazoo.