So, I just looked it up and people with hemochromatosis are able to safely (all other conditions being okay) donate blood, and are allowed to do so more frequently than usual. Previous restrictions were based on the concern that they might lie about dangerous things like HIV, because they couldn’t afford to pay for blood removal.
The treatment for most acute lead poisoning is not bloodletting, it’s https://en.wikipedia.org/wiki/Chelation_therapy
Which, as with all medicine has its share of idiots claiming it can fix heart disease or autism or whatever.
You’re specifically referring to phlebotomy for high iron levels
https://www.mayoclinic.org/diseases-conditions/hemochromatosis/diagnosis-treatment/drc-20351448
So, I just looked it up and people with hemochromatosis are able to safely (all other conditions being okay) donate blood, and are allowed to do so more frequently than usual. Previous restrictions were based on the concern that they might lie about dangerous things like HIV, because they couldn’t afford to pay for blood removal.