From the story here, which just shows that "co-authorship" is often simply designed to lend authority to the findings and is specious because the co-author really isn't contributing anything meaningful and is never intended to:
The study’s co-author [Donald P. Green], an esteemed Columbia University political science professor, asked the journal Science to retract the groundbreaking paper, saying he was deeply embarrassed by the incident. ... “Michael LaCour’s failure to produce the raw data coupled with the other concerns noted above undermines the credibility of the findings,” he wrote. “I am deeply embarrassed by this turn of events and apologize to the editors, reviewers and readers of Science.”
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Green got just what he deserved. The practitioners of "science" aren't worthy of the name.
