- Course Introduction
- 01: Evidence & DNA
- 02: Forensic Biology
- 03: DNA Extraction & Quantitation
- 04: DNA Amplification
- Overview
- Introduction
- Amplification
- Primer Design
- Primer Length
- Primer Melting Temperature
- Primer Annealing Temperature
- Values for Tm
- Maximum 3′ Stability
- GC Content Percentage
- No Secondary Structures
- No Self-complementarity
- No Complementarity To Other Primers
- No Long Runs With The Same Base
- Distance Between Two Primers On Target Sequence
- Plateau Effect
- Thermal Cyclers
- Thermal Cycling Parameter and Optimization
- Works Cited & Online Links
- Locus Selection
- Multiplexing
- Contamination
- Overview
- 05: Amplified DNA Product Separation
- 06: STR Data Analysis & Interpretation
- 07: Population Genetics & Statistics
- 08: Communicating Results
- 09: Other DNA Markers & Technologies
- Course Resources
- Laboratory Training Manual
President's DNA Initiative
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Advancing Justice Through DNA Technology
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Advancing Justice Through DNA Technology
DNA Analyst Training
Maintenance of Unsourced Contamination Profiles
Home > DNA Amplification > Contamination > Detection > Maintenance of Unsourced Contamination Profiles
There may be occasions when laboratories detect contamination, but are unable to determine the source. These instances will most likely occur in negative controls and/or reagent blanks. Unsourced contaminant profiles can be maintained by a laboratory for future comparison and can provide a mechanism for a laboratory to troubleshoot multiple occurrences of the same contaminant DNA profile.
For example, the laboratory may be able to:
- Isolate the profile to a specific consumable product
- Isolate the profile to a specific investigator(s)
- Isolate the profile to a specific staff member
