Health authorities in Maryland are investigating synthetic drugs known as ‘bath salts,’ a move that could lead to a ban on the sale or possession of the drugs.

Following a monthlong study, the state will decide whether to add them to the list of “Schedule 1” controlled dangerous substances, the Los Angeles Times reports.

Bath salts are sold at head shops and on the Internet with names such as Zoom and White Rush. These products also have been labeled as plant food and pond water cleaner and are sold in ways designed to elude detection or enforcement. Bath salts can cause symptoms including agitation, rapid heartbeat, hallucinations and seizures. They are designed to mimic the effects of cocaine or amphetamines, while eluding detection on employers’ drug tests.

The Maryland Poison Control Center has reported a big jump in calls about bath salts’ poisonings, from two last year to 20 so far this year, the article notes.

Bath salts have been banned by a number of states including Florida, Washington State, Kentucky, Louisiana, New York, North Carolina and North Dakota. Ohio and New Jersey are considering taking similar action.