PORTSMOUTH, N.H. — Two men have been charged with selling a form of synthetic marijuana in New Hampshire and Maine.

Kyle Hurley and Robert Costello are being held without bail following their arrest March 28 after a three-month investigation. It wasn’t immediately known if they had lawyers.

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The Portsmouth Herald reports the investigation took undercover agents to Portsmouth, Hampton, Seabrook and Kittery, Maine. It started with the purchase of synthetic marijuana from a Londonderry store on Dec. 31.

Costello allegedly told police he worked with someone who had a barn in Epping, where that person mixes the marijuana in cement mixers and then spreads it on plastic sheets. The product is then sprayed with synthetics.