Lab methods and instruments used to analyze forensic samples
Physical Science Unit-applies chemistry, physics, & geology to ID and compare evidence
Biology Unit-responsible for DNA profiling and comparison of hair and fibers
Firearms Unit-examines garments or objects in order to detect gunshot residue
Document Examination Unit-analyzes handwriting or typewriting
Photography Unit-uses specialized photographic techniques to examine/record physical evidence
Toxicology Unit-analyzes body fluids for presence or absence of drugs/poisons
Latent Fingerprint Unit- processes and examines fingerprints
Polygraph Unit-employs trained criminal investigators to interrogate suspects
Voiceprint Analysis Unit-analyzes telephone or recorded messages
Evidence Collection Unit-collect and preserve evidence at the crime scene
Estimating time or cause of death:
Autopsy (performed by a Medical Examiner)
Stages of decomposition:
Rigor Mortis- occurs within the 1st 24 hours, disappears within 36 hours
Livor Mortis- settling of blood in areas causing dark blue or purple areas on the skin
Algor Mortis- postmortum changes that cause a body to lose heat
Entomology (stages of blowflies and presence of other insects)
Potassium levels of ocular fluids
Digestive processes (stomach contents)
Four circumstances that justify a warrantless search
-In the process of a legal arrest
-Suspect consents to search
-Emergency situations, such as a fire
Frye vs. U.S.
Daubert vs. Merrell Dow Pharmaceutical, Inc.
Mincey vs. Arizona- Supreme Court case that dealt with impropriety of the warrantless collection of physical evidence at a homicide scene.
Michigan vs. Tyler- Supreme Court case that dealt with search and seizure procedures at an arson scene.
Safety and OSHA
OSHA-Occupational Safety and Health Administration, a division of the Dept. of Labor, establishes and enforces safety standards for the workplace.