A Somers Point couple has admitted running a large marijuana operation out of their home and using their teenage son to distribute the drugs, the Atlantic County Prosecutor’s Office said.Donna Shiffler, 40, pleaded guilty Tuesday to employing a juvenile, possession with intent to distribute marijuana, maintaining a production facility and endangering the welfare of a child.And the Press of Atlantic City reports John Garman, 39, pleaded guilty March 18 to employing a juvenile, possession with intent to distribute marijuana, maintaining a production facility, conspiracy to possess marijuana, endangering the welfare of a child and money laundering.