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Fastcase is a commercial legal search engine, akin to Westlaw and LexisNexis that is a "pay" site. However, the Oklahoma Bar Association has an agreement with Fastcase wherein all members of the Oklahoma bar have access through their bar number.
Like LexisNexis and Westlaw, Fastcase allows the user to search (by using the searchbox) or browse by selecting the correct resource and looking through a "table of contents."
Fastcase, compared with Westlaw or LexisNexis, is limited on secondary sources and on its citator tools.
Remember when using commercial sites such as Lexis Advance and Westlaw, these databases take the researcher directly to a commercial publication of the Oklahoma Statutes.
These are unofficial versions of the Statutes and should not be cited to. Check the official version of the statutes for any changes to the text and always cite to the Okla. Stat. Tit. not the Okla. Stat. Ann. Tit.
Just as with case law, statute research is not complete until it has been updated/Shepardized or KeyCited. (Go to "Keeping current" in this libguide for more information on citators.)
Below are screenshots of the commercial websites. Again, each have a somewhat distinct look, but do have similar features to help access the statutes.