They claim it is bullets in the gut piles that are left in the woods.
But some studies seem to say that there is lead in the natural surroundings, like Yellowstone especially. But it is more convenient to blame bullets, and ban lead.
In CA, all hunting is now lead-free ammo, due to ignoring the studies of natural lead sources in order to force lead-free on hunters. Try to find some of that non-lead ammo, and add in that all CA ammo purchasers have to be background checks.
“What Is California?”
For Two Hundred Dollars.