Jones contends that four guards at his prison used excessive force in subduing him. A jury in this action under 42 U.S.C. § 1983 returned a verdict for the defendants.

One of the jurors, Mark Koehn, is the anchorman of a news show at a television station in Madison, Wisconsin. During the interrogation of the jury panel, Koehn was silent when the venire was asked whether anyone knew the plaintiff. Jones contends that Koehn was untruthful, because his station broadcast a three-minute tape of Jones attacking a TV cameraman and being restrained by officers. Deceit by a juror required a new trial, Jones submits.

There are two problems. First, Jones did not raise this question in the district court and so has not preserved it for appeal. Second, the tape does not call Koehn's representation into question. We do not know whether Koehn saw the tape (newscasters do not always watch the signal that goes over the air) or whether, if he saw the tape, Koehn recalled the prisoner. Reporters deal wholesale with riots, murders, fires, and the like, so it is unlikely that they remember each protagonist. For all this record reveals, Koehn's mind was a tabula rasa to the characters and events of this case.

Jones' second contention is that John Van Dinter should not have been allowed to give expert testimony about the right way for guards to handle an aggressive inmate (and whether these defendants used it). Qualification as an expert witness is an issue for the district court, with deferential review. The district court did not abuse its discretion in deeming Van Dinter qualified. See Carroll v. Otis Elevator Co., 896 F.2d 210 (7th Cir.1990). That Van Dinter used defendants' version of the events as the basis for his opinion does not remove his testimony from the expert category. Counsel was free to examine this reliance in cross-examination. It used to be that experts were limited to answers based on assumed facts; the Rules of Evidence do not forbid what was once the only way to adduce the testimony.

AFFIRMED.