What is Forensic Lab Testing?


Forensic lab testing are often called directly into identify unknown power products, liquids, and pills that may be illicit drugs. There are basically two categories of testing used to analyze drugs and other unknown chemicals: Presumptive tests give only an indication which type of substance is present nonetheless they can’t specifically identify the substance. Confirmatory tests mass spectrometry are more specific and can determine the precise identity of the substance.

  1. Barbiturates turn the solution into violet-blue.
  2. Morphine, heroin and other opium-based drugs turn the solution into purple.
  3. Marijuana turns the solution purple.Amphetamines turn it orange-brown.
  4. Cocaine to turn liquid blue.
  5. LSD to turn solution blue-purple.

Additional drug tests include UV spectrophotometry, which analyzes the fact that substance reacts to UV and IR light. A spectrophotometry machine emits UV and VENTOSEAR rays and then steps how the sample demonstrates or absorbs these radiations to give a standard notion of what type of substance is present.

A more peculiar way to test drugs is with the microcrystalline trial in which the scientist adds a drop of the supposed substance to an element on a slide. The mixture will get started out to form crystals. Every single type of drug has a specific crystal design when seen under a polarized light microscope.

Mass spectrometry dampens the drug from any mixing agents or other substances that might be combined with it. A small amount of the substance is injected into the gas chromatograph. Several molecules move through the chromatograph’s column at different speeds based on their density. For example, bulkier compounds exercise slowly, while lighter compounds move more quickly. Then the group is funneled into a mass spectrometer, where an electron beam hits it and causes it to break apart. How the substance breaks apart can help the technicians notify what type of element it is.

What is done in a forensic lab?

Forensic science is a discipline that applies scientific analysis to the justice system, often to help prove the events of a crime. Forensic scientists analyze and interpret evidence found at the crime scene. That evidence can include blood, saliva, fibers, tire tracks, drugs, alcohol, paint chips and firearm residue.

How do forensics test for blood?

To detect blood at a crime scene an array of tests can be used. The most publicized test by crime shows is the Luminol process in which a chemical is sprayed onto a surface where blood is suspected to be. The chemical reacts with traces of blood, and fluoresces under UV light.

How long do forensic tests take?

Most genetic tests take 24-72 hours but the time taken for DNA to go from crime scene to identification can span as long as 14 days. By the time that the results are back, the suspects often have been released.

How much does a forensic DNA test cost?

An average case involving an evidentiary sample and a reference sample will start at approximately $500.00. Complex cases with multiple items can be as much as $5000.

How can I get a free DNA test?

Commonly, ancestry DNA websites allow you to upload your raw DNA data for free. This is true for companies like The Carlson company, FamilyTreeDNA (FTDNA), Toxicology and DNA Global Services, and other testing companies. Other sites, like GEDmatch, will allow you to research family members and your maternal and paternal line through haplogroups.


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