Marijuana businesses in Clark County, Nevada – which includes Las Vegas – will have to be careful about how they promote their businesses or risk penalties or even a loss of licenses.

The director of the Department of Business Licenses in Clark County has told local marijuana companies that promoting public use of cannabis or getting involved with non-licensed MJ businesses could result in the suspension or loss of licenses.

Holloway also said cannabis usage on tour buses and limousines is against the law.

The letter was sent in response to several reported violations, including one MJ business that promoted cannabis-assisted karate and yoga workouts, a county spokesman told the newspaper.

The president of the Nevada Dispensary Association, Andrew Jolley of The Source dispensary, believes this is the first time the business license office has threatened to take away marijuana business licenses.

The edict comes at a time when Clark County commissioners are discussing whether to allow cabs that advertise cannabis companies to transport passengers to and from Las Vegas’ McCarran Airport.