But investigators said that a search of his computer -- dating to an arrest on unrelated charges early this year -- showed that he'd downloaded a publication, "Standard Operating Procedure for Ricin" about safely handling the toxin and another file, about two hours later, about a method for detecting ricin.
Investigators searched these and found that on New Year's Eve 2012 someone had downloaded a publication, "Standard Operating Procedure for Ricin, " about safely handling the toxin.