FDC FDC DNA Databases & CODIS

Question 1

What does CODIS stand for in the context of forensic DNA?

Accepted Answer

Combined DNA Index System

Answer

CODIS stands for Combined DNA Index System, the FBI's national DNA database infrastructure used to link forensic DNA profiles.

Question 2

Which tier of CODIS is maintained at the national level by the FBI?

Accepted Answer

NDIS

Answer

NDIS (National DNA Index System) is the highest tier of CODIS, maintained by the FBI and containing profiles from all participating states.

Question 3

Which DNA profile index in CODIS contains profiles from unsolved crime scenes?

Accepted Answer

Forensic Index

Answer

The Forensic Index contains DNA profiles developed from crime scene evidence collected during unsolved criminal investigations.

Question 4

What is the minimum number of STR loci currently required for a CODIS core profile?

Accepted Answer

20

Answer

In 2017, CODIS expanded from 13 to 20 core STR loci to improve discrimination power and international compatibility.

Question 5

A 'candidate match' in CODIS must be confirmed by which process?

Accepted Answer

Re-extraction and re-analysis of the original evidence sample

Answer

A CODIS candidate match requires confirmation through re-analysis of the original evidence, not just comparison of the database profiles.

(FDC) Forensic DNA Certification Practice Test