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The second step is to assess each sample to determine if there are any extraneous peaks, and if they interfere with the interpretation process. Extra peaks within an allele range should be assessed following laboratory procedures.
Read more about Extraneous Peaks in this course.
Artifacts
Various artifacts can complicate and/or interfere with the interpretation process. Prior to interpreting allele designations, the analyst should evaluate each sample to determine if artifacts are present. All samples, to include controls and ladders, should be assessed for the following:
- Stutter
- 3'-A nucleotide addition
- Spurious peaks (spikes, blobs, noise)
- Pull-up
If any of these artifacts are present, the analyst should follow the procedures established by the laboratory.
Additional Online Courses
- What Every First Responding Officer Should Know About DNA Evidence
- Collecting DNA Evidence at Property Crime Scenes
- DNA – A Prosecutor’s Practice Notebook
- Crime Scene and DNA Basics
- Laboratory Safety Programs
- DNA Amplification
- Population Genetics and Statistics
- Non-STR DNA Markers: SNPs, Y-STRs, LCN and mtDNA
- Firearms Examiner Training
- Forensic DNA Education for Law Enforcement Decisionmakers
- What Every Investigator and Evidence Technician Should Know About DNA Evidence
- Principles of Forensic DNA for Officers of the Court
- Law 101: Legal Guide for the Forensic Expert
- Laboratory Orientation and Testing of Body Fluids and Tissues
- DNA Extraction and Quantitation
- STR Data Analysis and Interpretation
- Communication Skills, Report Writing, and Courtroom Testimony
- Español for Law Enforcement
- Amplified DNA Product Separation for Forensic Analysts