presumptive tests

Presumptive tests are preliminary chemical analyses used by law enforcement and forensic experts to quickly determine if a substance potentially contains a specific drug or illegal material. These tests produce a visible reaction, such as a color change, that suggests the presence of a particular substance. However, they do not provide definitive proof, as false positives can occur. Positive results from presumptive tests usually lead to more detailed confirmatory tests to accurately identify the substance. They are valuable for rapid screening but are not conclusive on their own.