FDC Study Guide 2026

Maintaining current certification and continuing education is a universal regulatory requirement.

ASCLD (American Society of Crime Laboratory Directors/Laboratory Accreditation Board) provides the primary accreditation program for forensic laboratories in the US.

Contamination in forensic labs is rigorously prevented through strict adherence to protocols, including the use of clean, designated workspaces, sterile equipment, and personal protective equipment. Separating samples, maintaining one-way workflows, and regular decontamination of surfaces also minimize the risk of transferring foreign DNA. These measures are critical to ensure the integrity of evidence and prevent false or misleading results in forensic investigations.

Polymerase Chain Reaction (PCR) is a fundamental technique in DNA analysis used to amplify specific segments of DNA, creating millions of copies from even a tiny sample. This amplification is crucial in forensic science because crime scene evidence often contains only minute amounts of DNA, which would otherwise be insufficient for further analysis. PCR enables the generation of enough material for techniques like STR profiling.

Sampling uncertainty arises because reference population databases contain a limited number of individuals, so estimated allele frequencies carry statistical uncertainty that can be addressed using confidence intervals or conservative estimates.

Quality controls are indispensable in forensic labs to verify the validity and reliability of testing results. By including known positive and negative samples, labs can confirm that the analytical methods are working correctly, detect potential contamination, and ensure the accuracy of the unknown samples being tested.