Court Filing
EXHIBIT S-11 Amended Supplemental Expert Disclosure: Katherine White The State has previously disclosed Katherine White (formerly Dace), Forensic Scientist III, as an expert witness in the field of biology and DNA, which includes, but in no way is limited to, DNA extraction, quantification, amplification, analysis and interpretation / analysis (including but not limited to STR data, Y-STR data; and STRmix probabilistic genotyping), forensic biology, serology, which includes, but in no way is limited to, examination of evidence for the presence of biological fluids, and trace evidence. The State hereby incorporates its responses and attachments filed on December 18, 2024, and February 16, 2025, and is hereby supplementing those responses as follows. White may testify about Deoxyribonucleic acid (DNA) which is a genetic material contained in cells that may be utilized for human identification. DNA may be present on an item in the form of biological materials such as blood, semen, and saliva or may be left on an item when it is handled. Biological evidence and possible / potential DNA evidence is collected for preservation and may be sent for further testing by qualified analysts. DNA can be collected by swabbing an item or by taking a cutting directly from an item. Reference DNA samples can be collected directly from individuals. DNA can be used to identify individuals, link individuals to crime scenes, link crime scenes, as well as exclude individuals from DNA profiles that we obtain. There are four steps to DNA analysis: 1. Extraction: add chemicals to break open all the cells to release the DNA. 2. Quantification: amount of DNA is measured within each sample. 3. Amplification: copy the specific locations of DNA using polymerase chain reaction. EXHIBIT S-11 STATE'S EXHIBIT exhibitsticker.com Amended Supplemental Expert Disclosure: Katherine White (Sealed) 1 S-11 CR01-24-31665 4. Developing a DNA profile: visualize the DNA profile, which look like peaks on a graph. Comparisons can be between evidence and reference samples to include or exclude an individual from a single source or mixture DNA profile. For exclusions to single source profiles, the exclusion can be made by visually comparing DNA profiles. For mixture samples, a software tool (STRmix) can be used to aid in this comparison. White may explain how reference samples can be used for comparison and how an individual may be excluded as a contributor to a DNA mixture profile. White was able to exclude a suspect as the source of the DNA profile previously obtained from item 1.1. This conclusion is explained in White's Report 6 (Bates Pages 607-626). White was the analyst tasked with performing presumptive testing, swabbing, and examinations on several items taken from 127 Parkside Ave, Blakeslee, PA (Pennsylvania State Police Department) which was taken from trash from the Kohberger residence, at 119 Lamsden Dr., Albrightsville, PA. White forwarded several of these items forward for DNA analysis. White is anticipated to explain what presumptive testing is, as well as the purpose and process of swabbing and examining evidence. Further details regarding the processing of items from the trash pull can be found in White's Report 16 (Bates Pages 5662-5683). EXHIBIT S-11 Amended Supplemental Expert Disclosure: Katherine White (Sealed) 2