I was thinking that, if this is true, "criminals" can
make their DNA 'vanish' by getting a transplant of bone
marrow and not be 'connected' to a crime as long as there
is no other physical evidence of your presence.

This also means you can't have kids after you get a
transplant because it won't be yours.

In this life, there's always a 'good and bad' part
of doing thing's isn't there.

Damned if you do and damned if you don't
so to speak...