A suspect, who was accused of sending letters poisoned with ricin to President Barack Obama and a US senator, was freed Tuesday after being held for a week.  Police did not specify the reason Paul Curtis, 45, was freed, but, Christi McCoy, Curtis’ lawyer, said her client is innocent that and someone close to him framed him. On Monday authorities searched Curtis' home and found neither ricin nor ingredients for the poison, an FBI agent testified in court. A search of Curtis’ computer yielded no evidence he had researched how to make the toxin, the agent said. The FBI is continuing its search for the perpetrator.