The RapidHIT represents a major technological leap—testing a DNA sample in a forensics lab normally takes at least two days. This has government agencies very excited. The Department of Homeland Security, the Department of Defense, and the Justice Department funded the initial research for "rapid DNA" technology, and after just a year on the market, the $250,000 RapidHIT is already being used in a few states, as well as China, Russia, Australia, and countries in Africa and Europe.One hugely important thing DNA analysis can do that other biometrics can't is to establish familial relationships. This 2011 piece about the RapidHIT technology mentions that the government found in one audit that 80% of relationship claims among asylum-seekers were fraudulent.
That, by itself, guarantees a certain level of demand for DNA analysis. The other use cases mentioned in the Mother Jones article linked at top are interesting, too.