Well, with vultures (and eagles) it is lead exposure from hunters' ammo that is a growing problem. Both in Europe and the US.
EU
USA
Banning lead ammo seems to be more difficult than at first anticipated. Especially across the pond hunters see this appeal as yet another sneaky pinko-commie grab for their guns and therefore resist it at all costs - a typical knee-jerk reaction devoid of any mental activity from people pretending to love nature and sometimes even professing ecological motives for their slaughter.
There are more sources for this topic on the interweb ...