Customs officers inspecting luggage at Washington Dulles International Airport thought something seemed off about chocolates in a woman’s luggage.

They searched the treats and found hashish inside.

During a routine secondary inspection on Monday, U.S. Customs and Border Protection officers realized that the four boxes weighing nearly 6 pounds didn’t contain only chocolate. A substance inside tested positive for THC/hashish, CBP said Thursday.

Ahdieh Bassam, a 49-year-old Iranian who lives in Oak Hill, Virginia, was charged with possession of a controlled substance. It wasn’t immediately clear if she had a lawyer.

CBP’s Baltimore field operations director said officers are always looking for travellers who try to sneak in illegal substances.

“Customs and Border Protection officers know that people will try a wide variety of creative concealment methods to smuggle illegal drugs into the United States, and it is our job to intercept these smuggling attempts,” Casey Durst said in a statement.

CBP officers turned Bassam and the chocolate over to Metropolitan Washington Airports Authority Police.