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A witness who knows no more than the average person is not an expert. The 'theory upon which expert testimony is . . . [admitted] is that such testimony serves to inform the court about affairs not within the full understanding of the average man.' United States v. West, 670 F.2d 675, 682 (7th Cir.), cert. denied sub. nom., King v. United States, 457 U.S. 1124, 73 L. Ed. 2d 1340, 102 S. Ct. 2944 (1982) (quoting United States v. Webb, 625 F.2d 709, 711 (5th Cir. 1980)).

As the Supreme Court has noted, 'expert testimony not only is unnecessary but indeed may properly be excluded in the discretion of the trial judge 'if all the primary facts can be accurately and intelligibly described to the jury, and if they, as men of common understanding, are as capable of comprehending the primary facts and of drawing correct conclusions from them as are witnesses possessed of special or peculiar training, experience, or observation in respect of the subject under investigation.'' Salem v. United States Lines Co., 370 U.S. 31, 35, 8 L. Ed. 2d 313, 82 S. Ct. 1119 (1962) (citation omitted). 

The trial judge ...

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