#Oxygen forensics reanalyses portable#
#Oxygen forensics reanalyses trial#
#Oxygen forensics reanalyses free#

They will then take samples from the areas that are showing the highest concentrations.ДЄs in other investigations, part of the investigator's job is to collect evidence from the scene to further the investigation.

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By comparing the concentration of hydrocarbons in the area to known levels of ILR free areas an investigator will be able to determine if ILRs are present at the scene. These are handheld electronic devices that sample the vapors at a scene and will give a reading for the concentration of hydrocarbons it is detecting.

#Oxygen forensics reanalyses portable#

Дetection with portable hydrocarbon sniffers is a recent method which is more readily being used by investigators. These canines have been trained to detect trace levels of ILRs and can lead an investigator to an area that will have a high probability of containing ILRs. A trained investigator would look for cues like intense localized burning or pour patterns to indicate the use of accelerants.ДЄccelerant detecting canines can also be used to determine if accelerants were used at a scene and pinpoint the location of use. Often the first and most common way of determining if accelerants were used is by completing a visual inspection of the scene and specifically the origin. Once the origin is determined the investigators must decide if fire accelerants were used at this scene. This is logical because accelerants would be the first materials ignited as they have a lower ignition temperature than any other materials. This is completed because the origin will have the highest probability of containing any ILRs left from the use of fire accelerant.

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Once a case is determined to be an arson, the detection of fire accelerants will hold strong evidentiary value which the prosecutor can use during the trial should someone be charged.Дetermining the origin of a fire is often one of the first tasks that a fire investigator must complete while at the scene. Gases such as propane or natural gas could also be used to accelerate a fire.Дetecting the use of a fire accelerant at a crime scene can be the difference between classifying a fire as accidental or as an arson. Although ignitable liquids are the most common fire accelerants it is possible to have other chemicals being used as a fire accelerant. Gasoline is the most common fire accelerant used but it could also be present at a scene as an ignitable liquid due to gasoline being a common fuel.

Ignitable liquids are not always fire accelerants, they may just be present at the scene under normal circumstances. It is important to understand that an ignitable liquid is a liquid that will readily ignite when exposed to an ignition source, while a fire accelerant is a material that is used to increase the rate of combustion for materials that do not readily burn. It is common for the words fire accelerant and ignitable liquid to be used synonymously. A farmhouse burning after being set on fire using gasoline as a fire accelerant