Hello, my brother recently died of what we assumed was a heroin overdose. The autopsy said he had a bag of white powder on his person, and it was apparent he just shot up. As it turns out, there was no heroin in his system at all. He died from acute furanylfentanyl intoxication. I assume that he bought it as heroin, but I really have no idea if that is true. He was a heroin addict for many years, should he have been able to tell the difference when he was "cooking" it? Just wondering what the most likely scenario was. Thanks.