- 01 Introduction
- 02 Biology of DNA
- 03 Practical Issues Specific to DNA Evidence
- 04 Introduction to the Forensic DNA Laboratory
- 05 Assuring Quality in DNA Testing
- 06 Understanding a Forensic DNA Lab Report
- 07 Statistics and Population Genetics
- 08 Mitochondrial DNA & Y-STR Analysis
- 09 Forensic DNA Databases
- 10 Collection of DNA Evidence from Suspects and Arrestees
- 11 Pretrial DNA Evidence Issues
- 12 Victim Issues
- 13 Trial Presentation
- 14 Postconviction DNA Cases
- 15 Emerging Trends
Principles of Forensic DNA
for Officers of the Court
for Officers of the Court
Module 6 :: DNA Lab Report
Topic 3 :: The Significance of DNA Results as Evidence
Special Interpretation Considerations Related to Sexual Assault Cases— Differential Extraction
In cases with sexual assault evidence, a differential extraction procedure is commonly used to separate sperm cells from all other cells present. If the extraction is efficient, sperm cells will end up in one tube and all other material will end up in another tube. These two separated portions are referred to as fractions.
