From googling the first major study was released in 2000. Before that the connection to brain damage was known.

Was the connection to crime specifically discussed at all, even though it wasn't proven?

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[–] 10 points 4 weeks ago

Not from what I remember. Lead was taken out and we knew it was bad but I don't recall people being like. we have a whole generations that effectively had brain damage. Man lead pipes since 1800 and then gas and paint from 1920 till the 70's. kinda crazy.

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