Maybe Lead Causes Autism Too

How do you measure exposure to lead? The usual—and most accurate—way is a blood test. The problem is that lead disappears from the bloodstream pretty quickly, so this only tells us about lead exposure in the past few months.

What if you want to know about lead exposure several years ago? Well, lead builds up in teeth, so you can take a look at that....
http://www.motherjones.com/kevin-drum/2017/06/maybe-lead-causes-autism-too