Dr. Renee Shields testified as a defense DNA expert during a pivotal admissibility hearing on June 22, 1995, challenging the prosecution's statistical methods for interpreting mixed DNA samples. Called by defense attorney William Thompson, she squared off against prosecution expert Dr. Bruce Weir, taking issue with both his methodology for calculating DNA mixture frequencies and his departure from National Research Council guidelines. Her testimony was substantial enough to prompt multiple rounds of cross-examination by prosecutor George Clarke and redirect by Thompson, all centered on whether the prosecution's DNA statistics should be placed before the jury.