Without commenting on this particular case and not condoning any amount of alcohol at all in a pilot's blood:
If a person was known to have taken a drink in the few minutes before the test there might be reason to take a further test a while later when the alcohol had been absorbed into the blood stream. However if a person had been drinking some time before, the comment "A third test was taken and the blood alcohol level reached .04%," does smack rather of the attitude "We're going to go on taking tests until we get the result we want."