Getting DNA from awkward places

Some of the DNA in bones and teeth can last for many years after a person has died. Scientists can examine DNA from people murdered a century ago, or even from 3000-year-old ancient Egyptian mummies by using the polymerase chain reaction (PCR). PCR makes millions of exact copies of a piece of DNA in just an hour or so. Scientists can use PCR to extract DNA from tiny samples that would be too small for older methods.

Scientists can use PCR on tiny samples of DNA that would be too small for older methods. The Forensic Science Service