Quote: Originally Posted by Tonington
There's far more than just a correlation here, but the fact that the correlation holds for counties, states/provinces, and at the country level is a good indicator that the correlation is not spurious. There is also well established biology. And lastly, even the lag is appropriate. It's not like they picked some number at random for the lag. The lag is important, because the lag comes from the difference between critical stages of brain development and the time to peak risk for criminal behaviour. That is well supported again, by biology, and by sociology/criminology. The last bit, is that the correlation and variability explained by the relationship isn't just to one indicator. For crime, it's against many different types of crime. Assault, robbery, murder, rape.Quote has been trimmed, See full post:
Of course it's not certain, but that is a strong case. The correlation suggests association. The biology provides a causal mechanism. The sociology and biology suggest time dependencies. None of that is easily dismissed.
Still I can think of a criticism, it would be nice to see a negative control where lead values haven't followed a similar trend to those geographies that were studied. And for those jurisdictions where the association isn't significant, it would be nice to see how the regressions perform with and without other leading associations in those areas.
Sloughing this off with out further research would be idiotic. Chemical, metals ingested have been shown time and again to cause long term and at times irreversible damage to the human body.
Mercury levels have also dropped or have they increased?
many older folks would be familiar with the mercury levels in Minamata Bay, Japan.
Mercury from what i recall was banned from batteries in NA. But not from those imported.
WHO | Mercury and health (external - login to view)
A significant example of mercury exposure affecting public health occurred in Minamata, Japan, between 1932 and 1968, where a factory producing acetic acid discharged waste liquid into Minamata Bay. The discharge included high concentrations of methylmercury. The bay was rich in fish and shellfish, providing the main livelihood for local residents and fishermen from other areas.
For many years, no one realised that the fish were contaminated with mercury, and that it was causing a strange disease in the local community and in other districts. At least 50 000 people were affected to some extent and more than 2000 cases of Minamata disease were certified. Minamata disease peaked in the 1950s, with severe cases suffering brain damage, paralysis, incoherent speech and delirium.
https://www.google.ca/#q=mercury+lev...merica&spell=1 (external - login to view)