Collins harshly criticized the panel for failing to mention how many of the advanced, more elaborate tests Gatlin had passed before and after the 2006 positive test. Collins had argued that Gatlin unknowingly had a testosterone cream applied to him by a disgruntled massage therapist, who repeatedly has denied the allegations.
The sprinter also said he received an injection of what supposedly was vitamin B-12 from Randall Evans, an assistant to coach Trevor Graham, in the weeks leading up to the Kansas competition.
While praising Gatlin's demeanor and cooperation, the panel said it could not rule out the possibility that he had knowingly taken the drug.
The panel noted Gatlin cooperated with US investigators probing the San Francisco-area Bay Area Laboratory Cooperative.
But Collins criticized the ruling for failing to mention that BALCO lead investigator Jeff Novitzky testified he found no evidence Gatlin ever knowingly used performance enhancing drugs.
Collins said he believes the panel was swayed by the fact that Graham was Gatlin's coach.
"It's guilt by association," he said.
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