Any residues present vaporize into the headspace and adsorb to the carbon strip. Passive headspace also involves heating the sample, but this time for a longer period of time, and with the use of a carbon strip for concentration. It is then removed using a syringe and injected into a gas chromatograph. Heated headspace involves the heating of the sample to allow any residues present to vaporize into the headspace, or area above the debris, in the can. These samples are tested for ignitable liquid residues using two main methods, heated headspace and passive headspace. The samples are submitted for analysis in airtight containers, usually paint cans for solid debris, or in mason jars for liquid samples. Scientists also provide crime scene examination and reconstruction and training to the law enforcement agencies within the State of New Jersey.įire Debris Analysis involves the determination of whether or not added ignitable liquid residues are present in samples obtained from fires. The Trace Evidence Unit can also provide testing not covered under our scope of accreditation in the following areas: The accredited areas within Trace Evidence Analysis can be divided into eleven sub-disciplines: The significance of trace evidence is often overlooked, however, in the absence of probative biological evidence, trace evidence may be the only source that can provide crucial investigative information.įor evidence submittal to the Trace Evidence Unit, see the Evidence Field Manual link on the OFS home page. Trace evidence may provide a link between the victim and a suspect, a victim and a scene, or the suspect and a scene. The handling and analysis of trace evidence requires care and specialized techniques. Trace Evidence Analysis is the discipline of forensic science that deals with the minute transfers of materials that cannot be seen with the unaided eye.
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