Dr. Karl Williams, chief medical examiner of Allegheny county in Pennsylvania, has come across 15 deaths in the past week due to a lethal mixing of heroin and a drug called fentanyl. Fentanyl is a strong narcotic generally used as a painkiller for cancer patients, but these recent deaths were caused by a high dose of this drug mixed with heroin. The deceased were heroin users who acquired drugs that actually contained fentanyl. The person selling this drug most likely knowingly manufactured fentanyl, as it is not difficult to make with the right knowledge. This drug can be 10-100 times more potent than morphine and is currently being distributed on the streets in bags marked 'Income Tax,' 'Bud Ice,' and 'Theraflu."