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Forensic Manuals

      Biology Processing

The screening and preliminary processing of physical evidence for biological material (e.g., blood, semen, saliva). 

Breath alcohol Program (Implied Consent Unit)

The Implied Consent Unit services Oregon’s Breath Alcohol Program.  The Unit approves breath alcohol instruments, certifies the instruments, provides instrumentation, training and certification for the users and offers expert testimony. The services of this unit are not accredited.


Controlled Substances

Qualitative analysis of physical evidence to determine if a controlled substance is present. Also includes the analysis of evidence collected from suspected clandestine laboratory scenes to determine the identification of chemicals and processes used to manufacture controlled substances. Quantitative analysis may be performed on an as needed basis for methamphetamine cases only. 


Crime Scene/Field Investigations

The analysis of physical locations or objects suspected to be involved in a crime. Analysis may include recognition, documentation, collection and preservation of evidence and/or performing scientific analysis, interpretation, and reconstruction.



The analysis of biological evidence for the presence of autosomal-STR & Y-STR DNA.  When an interpretable DNA profile is developed, it can be compared to relevant standards and/or searched in the CODIS database.   DNA analysis is accomplished using the polymerase chain reaction and capillary electrophoresis to examine short tandem repeats. The DNA unit also manages and administers the State’s CODIS database.



Screening and comparisons of bullets and cartridge cases, firearm functionality, caliber determination of cartridge cases and projectiles, proximity determination tests and restoration of obliterated markings.  Tool mark analysis compares marks left during the commission of a crime to test marks from a tool possibly used in the crime.  The IBIS database is used for the correlation of fired cartridge cases to other entered cartridge case evidence in an attempt to provide links to previously unknown related crimes. 


Latent Prints

Latent print processing is the physical and chemical processing of evidentiary items to develop and preserve friction ridge detail.  Friction ridge detail developed on evidentiary items is subsequently compared to a person or persons or interest.  The Western Identification Network (WIN) Automated Biometric Identification System (ABIS) and the FBI’s Next Generation Identification (NGI) databases​ are composed of known fingerprint standards and can be utilized to search latent prints of unknown origin.



The qualitative analysis of biological fluids (e.g., urine) for controlled substances, common pharmaceuticals and poisons.  Quantitative analysis of drugs in blood is performed on postmortem toxicology cases.  Volatiles analysis (e.g., blood alcohol determination) is provided for ante-mortem and post-mortem cases.


Trace Evidence

The screening for and the analysis of ignitable liquids, explosives, fibers, glass, paint, hair, footwear, tire impressions and miscellaneous evidence. ​

  •  Arson
  • •  Glass
  • •  Fibers
  • •  Explosives
  • •  Impressions
  • •  Hairs
  • •  Paint
  • •  Miscellaneous