Sodium Nitroprusside is the test kit used for which substance?

Sodium Nitroprusside is commonly used as a test reagent for the identification of certain substances, most notably for detecting the presence of methamphetamine. The reaction it produces with methamphetamine leads to a specific color change that is indicative of its presence. This test exploits the unique chemical properties of methamphetamine, allowing law enforcement and forensic experts to confirm its presence during field tests or preliminary examinations of suspected narcotics.

The other substances listed do not produce a significant reaction with Sodium Nitroprusside, which is why the reagent is not utilized for testing cocaine, heroin, or marijuana. Each of these substances typically requires specific reagents tailored to their unique chemical structures for accurate identification.