It’s a wonderful thought and in an ideal world would work.

This is all off topic:

However the reality is, as soon as your Dna gets added to a database, you (and your whole extended family) firstly become a ‘suspect’ and secondly your most private of private information, relies on the integrity and security of the archive, both inevitably being compromised by the whims of the barely democratic incumbent Govt of the day, regardless of their persuasion it now seems.

The scandalous infant blood spot screening data base is a case in point. Govt is building a DNA data base of all new UK newborns by stealth. You are bullied into having the tests, but as I determined, the DNA test required is not private or destroyed following the checks for the rarest of rare deseases. The back-up of the information is also not secure. (The US has now confirmed this purpose as fact over there)

My off spring had the tests, but thanks to a true and democratic Doc, the identification details were slightly confused in the system to say the least!!

DNA is a great tool, but is/will be greatly missused.