When testing cocaine suspended in liquid, what is the first step?

In testing cocaine suspended in liquid, the first step should involve sampling each layer with a NIK test. When dealing with a mixture that contains both organic and aqueous layers, using the NIK test on each layer helps to determine the presence of cocaine or other substances without risk of contaminating or misinterpreting the results from one layer to another.

Utilizing the NIK test allows for specific identification of cocaine. Each layer can have different chemical constituents, and testing them separately ensures a clearer and more accurate analysis of what each layer contains. The results from each layer can provide critical information regarding the sample's composition.

This testing helps to reveal the distinct properties of the substances present and ensures that any conclusions drawn about the presence of cocaine in either layer are reliable and supported by evidence.