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Customer Notification

Information for Customers Requiring Trace Evidence Analysis

The Trace Evidence Department of Cuyahoga County Regional Forensic Science Laboratory performs analysis of paint, gunshot residue, hair, fibers, unknowns, impression evidence, body fluid identification, physical comparisons and blood stain pattern interpretations. The following methods are used for trace evidence analysis in forensic cases by the Trace Evidence Department:

 ANALYSIS CATEGORY                         METHOD/TECHNIQUE
 
Serology (Body fluid Identification) • Blood - Chemical tests using Hemastix, Abacus Diagnostic Hematrace Card and Luminol
• Semen - Chemical tests using AP Two step test and ABA P30 cards; Microscopic Examination
• Saliva - Amylase Diffusion Test
   
Gunshot Residue Analysis • Scanning Electron Microscopy/Energy Dispersive X-ray Spectrometry 
   
Paint/Polymers  • Microscopic examination using Stereomicroscope, Compound Microscope, Comparison Microscope, Polarized Light Microscope
• Scanning Electron Microscopy/Energy Dispersive X-ray spectrometry
• Fourier Transform Infrared spectrometry 
   
Fiber Examination  • UV-VIS microspectrophotometry
• Microscopic examination using Stereomicroscope, Compound Microscope, Comparison Microscope, Polarized Light Microscope
• Scanning Electron Microscopy/Energy Dispersive X-ray spectrometry
• Fourier Transform Infrared spectrometry
   
Hair Examination  • Microscopic Examination using Stereomicroscope, Compound Microscope, Comparison Microscope, Polarized Light Microscope 
   
Tape Examination  • Microscopic examination using Stereomicroscope, Compound Microscope, Comparison Microscope, and Polarized Light Microscope
• Scanning Electron Microscopy/Energy Dispersive X-ray spectrometry
• Fourier Transform Infrared spectrometry
   
Physical Match Comparison  • Direct comparison
• Stereomicroscopy
   
Examination of Unknowns  • Microscopic Examination using Stereomicroscope, Compound Microscope, Comparison Microscope, and Polarized Light Microscope
• Scanning Electron Microscopy/Energy Dispersive X-ray spectrometry
• Fourier Transform Infrared spectrometry
   
Impression Evidence • Direct comparison / Known impressions
• Photographic Overlays