Ricin case: Affidavit offers no motive

From a dust mask that tested positive for ricin, to an enigmatic dump of a coffee grinder, to talk of making and mailing "poison," an affidavit unsealed Tuesday shed light on the case against a Mississippi man accused of sending potentially deadly letters to President Barack Obama and others.



via CNN.com - Top Stories http://edition.cnn.com/2013/04/30/us/ricin-investigation/index.html?eref=edition