The D.C. Council voted Tuesday to raise the stakes for businesses caught selling synthetic marijuana, making it a $10,000 misstep on the first violation, DCist reported Tuesday.

The bill calls for a $10,000 fine to any business caught dealing the synthetic marijuana for the first time, and doubles the amount on the second offense. Emergency legislation introduced by Mayor Muriel Bowser two weeks ago also allows the police chief to shut down any business caught with selling the substance, according to DCist.

District officials began to show concerns about synthetic marijuana after at least seven people in D.C.’s largest homeless shelter overdosed on the substance, the Washington Post reported earlier this month.

Synthetic marijuana offers similar effects to authentic marijuana, and is comprised of a herbal mixture, according to the National Institute on Drug Abuse. The synthetic concoction is often marketed as a safe and legal alternative to marijuana despite reports of it containing unnatural substances like chemical additives.

Marijuana was decriminalized in July and voters in D.C. passed a ballot initiative in November to legalize the substance.

Bowser announced the bill two weeks ago, along with two new units in the Metro Police Department centered on drugs and related crimes, DCist reported earlier this month.

“We believe these significant strategic changes will be of great help for our police department, both in terms of combating the new environment of illegal drug manufacturing and sales as well as increasing their visible presence in our communities and interacting with our residents,” Bowser said in a statement when introducing the bill.