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Since a dramatic peak in the 1980s, serial killers in the U.S. like Ted Bundy and Jeffrey Dahmer have been in decline for three decades. Experts have a few theories that can help explain why.
It’s called The Lead-Crime Hypothesis, and you can find vetted info on it, here (https://en.wikipedia.org/wiki/Lead–crime_hypothesis?wprov=sfti1).
Here’s a recent meta-analysis: https://www.sciencedirect.com/science/article/pii/S0166046222000667
Society has not yet realized how important it is to clean up this issue. But we’re getting there.
If you’re talking about removing lead from our society, it seems the progress made over the past 40 years has been incredibly dramatic