[aquamo]

One option might be to use a hash of one's DNA sequence and be done with it. The name identifier can then just be an image with any markings made by the person. This would then move name / id search from a character set problem to an image recognition problem. Works for me :-)

[deathanatos]

Chimeras: https://en.wikipedia.org/wiki/Chimera_(genetics)

Essentially, people can (sometimes) not have a single set of DNA.

And this has already caused issues:

> In 2002, Lydia Fairchild was denied public assistance in Washington state when DNA evidence showed that she was not related to her children. A lawyer for the prosecution heard of a human chimera in New England, Karen Keegan, and suggested the possibility to the defense, who were able to show that Fairchild, too, was a chimera with two sets of DNA, and that one of those sets could have been the mother of the children.