- 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 (cont.)
Labs may report these two fractions as—
- Male fraction and female fraction (though in a male on male assault, these terms may be misleading).
- Sperm fraction and non-sperm fraction.
- S (sperm) fraction and E (epithelial) fraction
- Fraction 1 and fraction 2.
Complete separation may not be possible for a variety of reasons. In such cases, one or both fractions may contain a mixture of sperm and non- sperm DNA. This does not necessarily preclude interpretation of results.
Note: the remainder of the module will use the terminology sperm and non-sperm fractions.
