My personal feeling on the decreases in violence and crime that it is very plausibly a lagging indicator showing the effect of the phase-out of leaded gasoline,

My personal feeling on the decreases in violence and crime that it is very plausibly a lagging indicator showing the effect of the phase-out of leaded gasoline, paint, etc. It is well documented that people with lead exposure during their developmental period have problems including more predisposition to violence and crime.