- 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 9 :: DNA Databases
Topic 1 :: Forensic DNA Databases
CODIS Hits
When CODIS software recognizes the same DNA profile in the Forensic or Offender Index, it identifies the two profiles as a match. These matches are commonly referred to as "hits."
After CODIS software produces a hit, qualified laboratory personnel analyze the DNA samples to either validate or refute the match. This is usually done as a precautionary measure to make sure there are no problems with data entry. There are times, however, when the DNA profile found on crime scene evidence is a mixture of more than one person's DNA. In that case, analysts must compare profiles to see if the offender's profile is part of the mixed DNA.
