It's a really strong study. N= ~1500, the cost-benefit ratio from remediation in improved education outcomes and lower social costs of crime is 1.8. Probably 1 million children across the US have been impacted by elevated blood lead levels over the last 20 years. there is no good reason to postpone acting on this problem, which is well understood by now.
https://www.dropbox.com/s/07z65p9a5wdppfl/LifeAfterLead_AEJ_...