When we report on stories such as that one, we take for granted the idea that peoples' bodies can be identified with certainty, not just by their clothing or by their fingerprints, but by their DNA. We can also link criminals to victims or to evidence and we can link people to their biological relatives.
The campaign, which developed the BRCA II test, recommends it only in cases where a very strong family link exists - perhaps in cases where more than two relatives have developed the disease, or where a very young close relative has fallen ill.