1. Chemical Analysis:
* Chromatography: This technique separates components of a mixture, used for identifying drugs, poisons, and other substances.
* Spectroscopy: Analyzing the interaction of light with molecules, used for identifying substances, determining concentrations, and analyzing complex mixtures.
* Mass spectrometry: Measuring the mass-to-charge ratio of ions, used for identifying unknown substances and determining their structure.
* Titration: A method used to determine the concentration of a substance by reacting it with a solution of known concentration.
2. Trace Evidence Analysis:
* Luminol: A chemical that glows in the presence of blood, even when it has been cleaned.
* Cyanoacrylate (Super Glue): Fumes from cyanoacrylate polymerize on latent fingerprints, making them visible.
* Fluorescent powders: Used to develop latent fingerprints on various surfaces.
* Sodium rhodizonate: A chemical used to detect gunshot residue on hands or clothing.
* Silver nitrate: Used to detect the presence of chloride ions, which are found in gunshot residue.
* Microscopic analysis: Used to identify fibers, hairs, and other microscopic evidence.
3. DNA Analysis:
* Restriction enzymes: Used to cut DNA at specific locations, allowing for analysis of DNA fragments.
* Polymerase chain reaction (PCR): A technique used to amplify DNA, allowing for analysis of small amounts of DNA.
* DNA probes: Used to identify specific sequences of DNA.
* STR (Short Tandem Repeat) analysis: A technique used to analyze short, repeated sequences of DNA, used for identification and paternity testing.
4. Drug Analysis:
* Colorimetric reagents: Used to identify drugs through color changes.
* Immunoassays: Tests that use antibodies to detect specific substances, used for identifying drugs and toxins.
* Gas chromatography-mass spectrometry (GC-MS): A powerful technique used for identifying and quantifying drugs and other substances.
5. Fire Investigation:
* Accelerants: Chemicals used to start or accelerate a fire, such as gasoline and kerosene.
* Gas chromatography: Used to identify accelerants in fire debris.
* Carbon monoxide detectors: Used to detect the presence of carbon monoxide, a product of combustion.
6. Toxicology:
* HPLC (High Performance Liquid Chromatography): Used to separate and identify toxins in biological samples.
* Immunoassays: Used to screen for the presence of toxins in biological samples.
* GC-MS: Used to identify and quantify toxins in biological samples.
This is not an exhaustive list, and the specific chemicals used in a forensic investigation will depend on the nature of the case.
It's important to note that forensic science is a complex field that requires specialized training and expertise. The chemicals used in forensic investigations should only be handled by qualified professionals.
