Three-in-one saliva drug detection board: through saliva collection and detection comparison. Morphine / methamphetamine / ketamine (K powder), three-in-one detection reagent, simultaneously detect the above three drugs. 1. Morphine: heroin, white powder, opium, smoke, codeine, federal cough water (shaking head water), yellow skin (material) and other opioid drugs; 2. methamphetamine: methamphetamine, magu, and fruit Other drugs such as methamphetamine stimulants; 3. Ketamine: K powder, K;