The U.S. Attorney's Office in Puerto Rico is for the first time prosecuting a suspected drug-trafficking organization on charges of distributing methamphetamine in the U.S. territory.

Sixteen suspects have been charged with conspiracy to possess with intent to distribute meth and the date-rape drug gamma-butyrolactone, known as GBL. One of the suspects is the son of a local mayor.

An indictment released Thursday says the meth came from California and the GBL from China.

The U.S. Drug Enforcement Administration began investigating the organization in September 2013.