“The vast evidence supports an increased likelihood of a decrease in IQ. Even a blood level of 1 to 4 μg/dl—which is not yet considered above the reference level—drops the mean IQ by 3.7 points. This reduces the number of high achievers, or those with an IQ over 130, and increases the number with low IQ, at 70—shifting that bell-shaped curve to the left. This impacts not only life achievement expectations but special education services and employment prospects. This has drastic implications at the population level.
