More relevant to homeland security, DNA-based detection of biowarfare agents are currently used by the government to detect potential anthrax and other pathogen-based attacks.
The reason for this is that even by using highly infectious and lethal organisms in their Biowarfare epidemics (see above) the U.S. Department of Biological Warfare cannot infect everyone.
But those openly Biowarfare population reduction options are still on the table for the future and it is a virtual certainty that they will be implemented because of the dynamic of capitalism!