Solution to lead poisoning: DON'T PUT LEAD PAINT IN YOUR MOUTH!
Don't let it get into the ground water, absorbed into crops and livestock, or atomized so people can breath it in particulates.
Lead poisoning is a real problem. Lead pipes and lead paint were serious sources of poisoning even without chewing on your exterior siding or interior walls.
It also initiates tooth decay and has a cumulative effect on the body like mercury.
The solution to lead poisoning is to simply not use lead unless it is absolutely necessary... in things like bullets, protective plating to block x-rays or radioactive exposures, solder, batteries, etc...
A similiar problem with lead can be illustrated with uranium, which if not mined and taken out of the ground in sensitive areas, will leech into water supplies. Lead sulfide is nasty stuff. Lead is also often hardened with arsenic, which, excuse the f--- out of me for saying so, isn't exactly like eating a marshmellow...
Barnes bullets makes some really great all copper bullets!!! ...so lead in bullets is not necessary, simply more cost effective..