Which test kits are particularly sensitive to light and heat?

• A. Cocaine
• B. Marijuana
• C. Meth and Ecstasy
• D. Heroin

Answer: (C)

Test kits that rely on color-changing reagents can be affected by environmental factors. Some of these reagents are highly unstable when exposed to light and heat, causing the color result to fade, shift, or appear inaccurately if the kit isn’t stored and used promptly. The reagents used to detect methamphetamine and MDMA are especially sensitive to light and heat, so their color reactions can degrade quickly or change in the presence of heat or bright light. That’s why these particular test kits require careful handling: store them in a cool, dark place and read the results within the recommended time window to ensure reliable interpretation.