Wet Stains on Nonabsorbent Surfaces
Collection procedures for wet stains on nonabsorbent surfaces are as follows:
- Use one or more sterile swabs (or sterile gauze for larger stains) to soak up the stain.
- Concentrate the stain on one portion of the tip of the swab.
- Allow to thoroughly air-dry.
- Collect the control sample by slightly moistening the swab with distilled water and rubbing an area of the surface in an unstained region near the stain.
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