When a court-appointed special master last year rejected the claim of an Alabama couple that their daughter had suffered seizures after a vaccination, she explained her decision in part by referring to material from articles in Wikipedia, the collaborative online encyclopedia.

The reaction from the court above her, the United States Court of Federal Claims, was direct: the materials “culled from the Internet do not — at least on their face — meet” standards of reliability. The court reversed her decision.

Oddly, to cite the “pervasive, and for our purposes, disturbing series of disclaimers” concerning the site’s accuracy, the same Court of Federal Claims relied on an article called “Researching With Wikipedia” found — where else? — on Wikipedia. (The family has reached a settlement, their lawyer said.)

A simple search of published court decisions shows that Wikipedia is frequently cited by judges around the country, involving serious issues and the bizarre — such as a 2005 tax case before the Tennessee Court of Appeals concerning the definition of “beverage” that involved hundreds of thousands of dollars, and, just this week, a case in Federal District Court in Florida that involved the term “booty music” as played during a wet T-shirt contest.