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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 BlueStar
• Semen - Chemical tests using AP Two step test and ABA P30 cards; Microscopic Examination
• Saliva - Amylase Diffusion Test, SALIgAE
   
Gunshot Residue Analysis • Scanning Electron Microscopy/Energy Dispersive X-ray Spectrometry 
   
Paint/Polymers 

• Microscopic examination using Stereomicroscope, Compound Microscope, Comparison Microscope, Polarized Light Microscope
and Fluorescence Microscope 
• Scanning Electron Microscopy/Energy Dispersive X-ray spectrometry
• Microscopic examination using Stereomicroscope, Compound Microscope, Comparison Microscope, Polarized Light Microscope, and Fluorescence Microscope
• Scanning Electron Microscopy/Energy Dispersive X-ray spectrometry
• Fourier Transform Infrared spectrometry

   
Fiber Examination • Microscopic examination using Stereomicroscope, Compound Microscope, Comparison Microscope, Polarized Light Microscope and Fluorescence Microscope 
• Scanning Electron Microscopy/Energy Dispersive X-ray spectrometry
• Fourier Transform Infrared spectrometry
   
Hair Examination 

• Fourier Transform Infrared spectrometry

• 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 and Fluorescence Microscope
• Scanning Electron Microscopy/Energy Dispersive X-ray spectrometry
• Fourier Transform Infrared spectrometry
   
Physical Match Comparison 

• Fourier Transform Infrared spectrometry
• Direct comparison
• Stereomicroscopy

   
Examination of Unknowns  • Microscopic Examination using Stereomicroscope, Compound Microscope, Comparison Microscope, and Polarized Light Microscope, and Fluorescence Microscope
• Scanning Electron Microscopy/Energy Dispersive X-ray spectrometry
• Fourier Transform Infrared spectrometry
   
Impression Evidence • Direct comparison / Known impressions
• Photographic Overlays 
   
Bloodstain Pattern Examination • Direct observation / Pattern classification
• Area of Convergence determination
• Area of Origin determination