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absorb absorption acid alcohol amphetamines analysis analytical anti-B antibodies antigens atom barbiturates barrel blood type bloodstains body Breathalyzer bullet carbon characteristics chemical chromatography collection color comparison comparison microscope concentration contain Courtesy New Jersey crime laboratory crime scene criminal investigation criminalist curare density detection determine developed document drug electron elements energy examination example explosive False fibers fibres fingerprint fire firearm Forensic Science forensic scientist frequency gas chromatograph glass hair heat heroin human identification individual infrared Jersey State Police Journal of Forensic known light liquid located marijuana mark material microscope molecules neutron object origin oxidation oxygen packaged particles pattern percent physical evidence polymer potassium dichromate powder present prints procedures produce protons reaction red blood cells refractive index residues ridge rifle sample shown in Figure soil solid specimen spectrum stain substance surface suspect swabs technique temperature tion tool toxicologist trace United victim weapon X-ray