The major source for environmental lead during the second half of the 20th century has been gasoline, not ammunition, and the correlation is quite well establis

The major source for environmental lead during the second half of the 20th century has been gasoline, not ammunition, and the correlation is quite well established: https://en.wikipedia.org/wiki/Lead%E2%80%93crime_hypothesis https://en.wikipedia.org/wiki/Lead%E2%80%93crime_hypothesis