In D Magazine Partners LP v. Rosenthal, reviewing the work of the Dallas Court of Appeals in a high-profile anti-SLAPP case, the Texas Supreme Court observed about Wikipedia:
“Given the arguments both for and against reliance on Wikipedia, as well as the variety of ways in which the source may be utilized, a bright-line rule is untenable. Of the many concerns expressed about Wikipedia use, lack of reliability is paramount and may often preclude its use as a source of authority in opinions. At the least, we find it unlikely Wikipedia could suffice as the sole source of authority on an issue of any significance to a case. That said, Wikipedia can often be useful as a starting point for research purposes. In this case, for example, the cited Wikipedia page itself cited past newspaper and magazine articles that had used the term ‘welfare queen’ in various contexts and could help shed light on how a reasonable person could construe the term.”
But, as a matter of the relevant substantive law, and the nature of Wikipedia, the Texas Supreme Court found overreliance on a Wikipedia entry when “the court of appeals utilized Wikipedia as its primary source to ascribe a specific, narrow definition to a single term that the court found significantly influenced the article’s gist. Essentially, the court used the Wikipedia definition as the lynchpin of its analysis on a critical issue. . . . ”
Accordingly, Dallas-area practitioners should pay special attention to these statements, if online resources such as Wikipedia play more than a general background role in a legal argument.