You'd have to be an idiot and you'd deserve your Darwin award
As for a place to get it, harvest on public land, of the only thing that looks like it on birch trees, no look alike. Harvest from the highest point on the tree you can reach.
Leave 1/5 of the patch you harvest behind.
If you can't identify Chaga on birch, you shouldn't buy your own groceries
You'd have to be an idiot and you'd deserve your Darwin award
As for a place to get it, harvest on public land, of the only thing that looks like it on birch trees, no look alike. Harvest from the highest point on the tree you can reach.
Leave 1/5 of the patch you harvest behind.
If you can't identify Chaga on birch, you shouldn't buy your own groceries