[octex]

I know that decades ago, one had to have a blood-test prior to getting married to make sure than the couple were not related although they coined it as testing for STD’s. A county official told me that was the actual reason for blood tests, although she might have been joking.
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I first married in 1962 in Texas, at age 19. Blood tests were required then to ensure no close relationship. There was no info about HIV back then.

[wintertime]

In 1962 genetic testing had not yet been developed.