(CNN)Veteran doctors don't need a blood test to tell when someone is on the verge of a drug overdose. They can even narrow down the culprit by observation alone. Dilated pupils mean cocaine, amphetamines, maybe LSD. Constricted pupils mean an opiate. Additionally, an opiate abuser is characteristically "nodding out" and often scratching their itchy skin. While their face is becoming pale and clammy, their fingernails and lips are starting to turn blue or even a sickly purplish-black. When the choking noises -- or the deep snore gurgling sounds, known as the death rattle -- begins, it's time to act -- and fast. That is a pretty clear sign the opiates have just turned off the person's drive to...
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