Hmm, I've been studying for biotech and I was thinking about Asimov's Foundation series. One wonders, "How does a government keep track of those trillions upon trillions of people?" (it's specified that a special type of social science done in the book requires multiple trillions to do calculations). In biotech we've been working with STR's (short tandem repeats) which are these repeats in the large sections of DNA that doesn't code for anything. They have specific frequencies in a population (1/2000 people, for example), but when multiple locations of STR's are used the frequency becomes much larger. For 13 locations the frequency can be in the trillions. There are hundreds of locations so the possible highest frequency would be an unimaginably high number, and thus you could have a specific way of personal identification for every person in your galaxy spanning empire. Take a piece of hair, plug it in to your high tech pocket identifier (beep boop, running analysis for 16 loci) and boom you have your man.
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All that is gold does not glitter, Not all those who wander are lost
The old that is strong does not wither, Deep roots are not reached by the frost
From the ashes a fire shall be woken, A light from the shadows shall spring
Renewed shall be the blade that was broken, The crownless again shall be king