What is the specific field test kit used for identifying heroin?

The Marquis Reagent is specifically designed for the identification of opiates, including heroin. When heroin is mixed with the Marquis Reagent, it produces a distinct color change, which serves as a strong indicator of the presence of the substance. This color reaction is a critical aspect of field testing because it allows law enforcement officers to quickly and effectively identify suspected drugs on-site, which is essential for making informed decisions during traffic stops, searches, or other enforcement actions.

In contrast, while other options may be tools used in drug testing or forensics, they are not specifically tied to the identification of heroin. The SIRCHIE kits are more general and can be used for a variety of testing purposes but do not provide the same specific chemical reaction for heroin identification. The NIK tests, while also useful for identifying various drugs, are not the primary test utilized for heroin and may be more geared toward other substances. The specificity of the Marquis Reagent to opiates makes it the correct choice for identifying heroin in the field.