The admissibility of expert testimony in Illinois is largely subject to the standard of “general acceptance” set forth in Frye v. United States, 293 F. 1013 (D.C.Cir.1923). The methodology used by an expert must be sufficiently established to have general acceptance in the field to which it belongs. General acceptance does not require unequivocal acceptance, and the existence of a dispute over a particular methodology will not preclude admissibility. Rather, general acceptance takes into account whether there is consensus or controversy as to whether a methodology is relevant.
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