U.S. Department of Homeland Security Directs and Funds Development of PositiveID Corporation's Ricin Detection Assay to Protect Nation Against Biological Threats Company Launches Detection Assay With New White Paper on Its Ricin Assay at www.positiveidcorp.com DELRAY BEACH, Fla., Oct. 18, 2011 (GLOBE NEWSWIRE) -- PositiveID Corporation ("PositiveID" or...