Variant hemoglobins (see sickle-cell anemia;hemoglobinopathy) can be used to trace past human migrations and to study genetic relationships among populations.
The only major objection came from Justice Antonin Scalia, who offered an even more robust defense of state privileges going back to the Alien and Sedition Acts.
There is a military expression that dates back to Roman times, I'll spare you another Latin lesson but the phrase translates or the phrases translates roughly to leave no one behind.