[FavouriteColour]

Pro: Law enforcement has access to a great tool for identifying people.

Con: Government has access to a great tool for identifying people.

[renholder]

Another Con: In the not-too-distant future, a sequence can be recreated from the digital record[s].

Another Con: Assuming that you can copy the database out, all you need is one instance of the Y-Chromosome's owner name and you can find their children and children's children and...