As you probably know, there has been a dramatic increase in autism in the past few years. Many scientists are searching for causes and treatments but nothing firm has been found yet. There have been some corrrelations observed between environment and behaviors and the occurance of autism such as increases in air pollution and obesity of the mother while carrying the fetus. But, a correlation is not a proof; it is an observation that some link may exist and it generally triggers a rigorous study to determine if the correlation is causal or coincidental.
However in one observed correlation with autism, further study is not only nonexistant, it is de facto banned from any funded study. There is a clearly observable correlation to the change of certain vaccines and autism. These vaccines used to use animal cells in the production process. The process was changed to use human fetal cells at the same time that the spike in autism cases occured. See Autism for more explanation.
The only possible reason for the de facto ban is political. It seems that our political leaders and many of our educators refuse to even examine the possibility of a negative side effect of using fetal cells. It has never made sense for politics to direct science and it certainly is inappropriate in this case.
Is there no organization in the world that has the courage to stand up to political forces and advance true scientific rigor in this case?