In the United States, junk science is any scientific data, research, or analysis considered to be spurious or fraudulent. The concept is often invoked in political and legal contexts where facts and scientific results have a great amount of weight in making a determination. It usually conveys a pejorative connotation that the research has been untowardly driven by political, ideological, financial, or otherwise unscientific motives.
The concept was first invoked in relation to expert testimony in civil litigation. More recently, invoking the concept has been a tactic to criticize research on the harmful environmental or public health effects of corporate activities, and occasionally in response to such criticism. In these contexts, junk science is counterposed to the “sound science” or “solid science” that favors one’s own point of view.
Wikipedia
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