The Drug Enforcement Administration (DEA) will classify illicit versions of fentanyl at the same level as heroin, Reuters reports. The action will make it easier for federal prosecutors and agents to prosecute traffickers of all forms of fentanyl-related substances, the agency said.

Legally prescribed fentanyl is classified as a Schedule II drug, which means it is highly addictive but has a medical purpose. The new DEA order classifies illicit fentanyl as a Schedule I drug, along with heroin. Schedule I drugs are considered addictive, with no medicinal purpose.

The DEA order will last up to two years, with a possibility of a one-year extension if certain conditions are met. In a statement, Attorney General Jeff Sessions said, “By scheduling all fentanyls, we empower our law enforcement officers and prosecutors to take swift and necessary action against those spreading these deadly poisons. I also urge the many members of Congress who clearly share our concern and alarm over fentanyl’s role in our opioid overdose epidemic to do their part by permanently scheduling these lethal substances.”