japs don't, i believe US don't either, no country does that, they only keep DNAs of criminals since majority of crime is commited by repeat offender anyway
Yeah, even if they confirmed that, it wouldn't be too useful. They should be able to know his age, but I don't think they'll get too far, mostly because it doesn't look like that kind of manga.
Next up is pensions, and that'll be the topic. A public affairs topic
I mean. It's spoilers territory. But there's a good reason the DNA is unlikely to be present in any database.
And even then, we saw someone "confirm" identity on one and not be able to do anything about it, because alibis.
Also worth remembering, at this point in the manga, the time that has passed has been around 4 or 5 days at max. The public is still reeling and confused.