The Los Angeles Board of Supervisors voted Tuesday to adopt an ordinance that makes it explicitly illegal to rent space to medical marijuana dispensaries in unincorporated areas of Los Angeles County.

Marijuana dispensaries have been illegal in unincorporated areas since 2011. The board relies on zoning laws to enforce the ban and recently vowed to crack down on violators, voting earlier this month to assemble an enforcement team.

The ordinance amends the existing ban to make clear that renting or leasing a property for use as a medical marijuana dispensary is illegal.

County lawyers called the amendment a “non-substantive change.”

Landlords can already be held liable for illegal drug sales on their property under federal law. A 2013 case against several Southern California landlords renting to dispensaries — later dropped by the U.S. Attorney’s Office — originally called for them to forfeit their properties. [Read more at MyNewsLA.com]