Nark II narcotic field tests are meant for presumptive field drug testing.
Choose from a variety of reagents (shown below):

• The Mandelin reagent is used to test for Methadone, Amphetamines or Methamphetamine
• MDPV reagent
• Mephedrone reagent
• a-PVP reagent
• 2-C synthetics reagent (MDMA and LSD)
• Psilocybin/Psilocin (mushrooms) reagent
• Mollies reagent
• Marquis reagent (Amphetamines/Methamphetamine, MDMA, or opium alkaloids)
• Special opiates (Oxycodone and Hydrocodone)
• Meckes modified reagent (semi-synthetic opiates of heroin (white, brown and black tar))
• Ephedrine/Pseudoephedrine reagent
• Valium, Rohypnol, Ketamine reagent
• Methamphetamine/MDMA (Ecstasy) reagent
• Nitric acid reagent (heroin, morphine)
• KN reagent (THC in marijuana dried plant material, seeds, or fresh green plan)
• The Dille-Koppanyi reagent (barbiturates)
• Fentanyl reagent
• Ehrlichs modified reagent (LSD)
• Duquenois-Levine reagent (THC in marijuana)
• Scott reagent modified (cocaine); powder, crack, or freebase
• Methadone reagent
  Both PCP/Methaqualone reagent