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Items falling into this category include non-intimate samples such as swabs from a windshield, sidewalk, wall, floor, weapon, etc. This category applies to mixtures that are not included in the two categories described above.
These mixtures are typically the most difficult category to interpret. In general, the interpretation of two-person mixtures (where each person donates half of the DNA) will not be aided by estimating percent contribution or percent peak height ratios.
Applying statistical interpretation is more simplistic with one contributor (e.g., single source samples or mixtures where a major component can be defined or inferred). Statistical evaluation of complex mixtures involves the use of the likelihood ratio or probability of inclusion/exclusion.
Read more about the likelihood ratio in course: Population Genetics & Statistics.
Read more about the probability of inclusion/exclusion in course: Population Genetics & Statistics.
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