Inappropriate requests bombard physicians constantly. And identifying honorable ones from the more nefarious diverts substantial time away from patient care.
Significant issues have plagued a paper that appeared in the journal Science since its publication a year ago. Consider the case now closed with the recent ruling that the two primary investigators involved committed scientific misconduct. 
A high-profile paper has finally been retracted by the journal Science after 10 months of investigation. The work has been ruled to be so full of negligence by an ethical review board – which discovered missing data and flat-out lies – it's a wonder how it was ever accepted in the first place.