The date is important because Feldman has said that Westerfield could not have dumped the body after Feb. 5, when police began watching his movements 24 hours a day.
Hall, interim vice provost for research at the University of Missouri-Columbia, said mummification of Danielle's body would have had "little, if any, effect on the flies." He said the body was infested by the blow flies "no later than Feb. 23, 2002, and no earlier than Feb. the 12, 2002."
Hall was called by the defense to rebut the testimony of two forensic experts produced by the prosecution. Dr. William Rodriguez, a forensic anthropologist with the Department of Defense, testified last week that van Dam was dead for four to six weeks. Hall said Rodriguez's conclusion was "inconsistent with the evidence I examined."
Hall said calculations by Chaminade University entomologist M. Lee Goff introduced Tuesday were simply incorrect.
Hall said that he would expect flies to begin laying eggs on the body at the first possible opportunity. He said it would be very unlikely that the body could lay in the open for five to seven days without any fly activity.
Prosecutors will continue their cross-examination of Hall after the lunch break.
Feldman told Superior Court Judge William Mudd on Tuesday that he may also call a witness on Monday. If he finishes examining witnesses then, closing arguments could begin Tuesday in the trial, which has lasted nearly two months.
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