 So when you say you'd never let them get into a car without you there, no, it can happen. One in four hot car deaths happen when a kid gets into an unlocked car and can't get out. Never happens. Before you leave the car, always stop, look, lock. Brought to you by NHTSA and the Ad Council. A fraction of a raindrop, three grains of salt, add up to 100 times more potent than morphine. The tiniest amount of illegal fentanyl is all it takes to cause an overdose.