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  2. Forensic chemistry - Wikipedia

    en.wikipedia.org/wiki/Forensic_chemistry

    Forensic chemists rely on a multitude of instruments to identify unknown substances found at a scene. [26] Different methods can be used to determine the identity of the same substance, and it is up to the examiner to determine which method will produce the best results.

  3. Characteristic property - Wikipedia

    en.wikipedia.org/wiki/Characteristic_property

    A characteristic property is a chemical or physical property that helps identify and classify substances. The characteristic properties of a substance are always the same whether the sample being observed is large or small. Thus, conversely, if the property of a substance changes as the sample size changes, that property is not a characteristic ...

  4. Forensic identification - Wikipedia

    en.wikipedia.org/wiki/Forensic_identification

    An unknown sample found at a crime scene is called a questioned sample. A known sample can be taken either from a suspect or found in a database. The FBI’s database used for DNA is CODIS, Combined DNA Index System. It has data at three levels: local, state, and national. The national level data is stored in NDIS, National DNA Index system.

  5. Chemical property - Wikipedia

    en.wikipedia.org/wiki/Chemical_property

    They can also be useful to identify an unknown substance or to separate or purify it from other substances. Materials science will normally consider the chemical properties of a substance to guide its applications.

  6. Forensic serology - Wikipedia

    en.wikipedia.org/wiki/Forensic_serology

    Forensic serology is the detection, identification, classification, and study of various bodily fluids such as blood, semen, saliva, and urine, and their relationship to a crime scene.

  7. CAS Registry Number - Wikipedia

    en.wikipedia.org/wiki/CAS_Registry_Number

    Screenshot of the CAS Common Chemistry database with information about caffeine ().. A CAS Registry Number [1] (also referred to as CAS RN [2] or informally CAS Number) is a unique identification number, assigned by the Chemical Abstracts Service (CAS) in the US to every chemical substance described in the open scientific literature, in order to index the substance in the CAS Registry.

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