The Ohio Bureau of Criminal Investigation is warning police and the public about a "more potent" form of the deadly opioid fentanyl hitting the streets in Franklin County and across the state. The new form of fentanyl, parafluorofentanyl, triggers more nerve receptors than fentanyl, making it a more potent form of the already deadly opiate, Ohio BCI said in a bulletin sent to law enforcement statewide this week. The drug was first detected in BCI's lab testing about a year ago but began being seen with more frequency in June.