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Human DNA is the ultimate fingerprint. A single hair can contain enough information to determine someone's identity — a feature that's been invaluable for identifying the unnamed casualties of natural disasters and war. But forensic scientists who use DNA say the technology isn't always available where it's most needed, like in poor countries, or in war zones like Syria.

The technology is often too expensive or too complicated, and where there are large numbers of unknown dead, you need far more than just DNA profiling equipment. You also need sophisticated computer programs to organize and match DNA samples from numerous family members, as well as experts to read the samples properly.

Alex John London, a medical ethicist at Carnegie Mellon University, says that while there are numerous groups that do DNA identification worldwide, and the process is often ad hoc and erratic.

It was largely the Indian Ocean tsunami that got forensic experts thinking. There were tens of thousands of unidentified bodies, and DNA experts flocked to Thailand to set up labs. Tom Parsons, a DNA expert with the...