CNN Starting Point May 31, 2013 11:09:00
Never reached them. white house spokesman jay carney has emphasized this in the past, when other threatening letters were sent to the president. >> the mail sent here is screened and that these tests are undertaken at remote sites to mitigate the risk both to those recipients and to the general population. >> reporter: the fbi is now testing the letters sent to president obama. meanwhile, the new york city police department says that preliminary testing on the bloomberg letter came back positive for ricin, a potenti potentially deadly poison made from caster beans. the third letter was opened ...