A city ordinance banning synthetic marijuana was put into effect on March 25, meaning anyone found in possession of the substance will be facing a hefty fine.

Robstown Police Chief Johnny Brown said officers have begun visiting various convenience stores around town to ensure any products containing synthetic marijuana, also known as salvia divinorum, have been removed from the premises.

"We're going to be making routine checks (in the future) to make sure everyone is in compliance (with the ordinance)," Brown said, adding that no businesses had been cited as of Monday.

The ban, which was approved in early January, makes it a violation to possess or sell synthetic marijuana products and any smoking devices found to have been used to ingest the substances.

Anyone found in possession of or selling synthetic marijuana products will be facing a fine of up to $2,000.