Scientists behaving badly: Journal editors reveal researchers' wicked ways.
Published online: 04 March 2004; doi:10.1038/news040301-9
Jim Giles

The annual report of the Committee on Publishing Ethics documents 29 instances of medical authors unethical publishing behavior. Some of the authors had plagerised while others tried submitting an already published paper. The Nature article reference a study published in JAMA 2004;291:974-980, where some authors were able to get their articles published five times.

The biggest concern for editors (as well as the readers) were the authors who had conflicts of interest or authors whose misconduct concerned medical treatments.