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In medicine and forensics there are many tests considered "presumtive".

Presumptive means that the test provides enough indication of a substance, but without the full testing needed to verify, scientifically, that the substance is present.

Probably one of the best known forensic presumptive tests is the one that tests for the presence of blood. Forensic workers can see a "red spot of fluid" on the floor, a take a swab. The swab is either coated with a chemical, or the swab is inserted into a container containing a chemical that will turn the fluid a certain color if the fluid is blood. But, the presumptive test is not considered fact until further testing in a lab shows that yes, the fluid was indeed blood.

I believe that law enforcement can also run presumptive tests in the field when they suspect a substance is a street drug. Normally, if the presumtive test changes colors, the suspected substance is also tested in the lab.

In courts, the lab tests give the evidence, not only the presumtive field testing (for both crime scenes and drug arrests).

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Why presumtive test are important?

Presumptive tests are crucial in various fields, particularly in forensic science and medical diagnostics, as they provide rapid and preliminary results that guide further investigation or treatment. They help in quickly identifying potential substances or conditions, allowing for timely decision-making. While not definitive, these tests can streamline processes, reduce costs, and prioritize cases based on urgency. Ultimately, they serve as an essential first step before confirming results with more specific, confirmatory tests.


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