Cornell has done research on Glyphosate
http://pmep.cce.cornell.edu/profiles/extoxnet/dienochlor-glyphosate/glyphosate-ext.html
Basically it kills weeds and is not absorbed into human or animal tissue even after prolonged exposure.
Who funded the study ?
Monsanto (glyphosate manufacturer)
OR ..
US Government (who indemnified Monsanto against lawsuits)?
I believe it was a German, or a Russian study, that demonstrated infertility in 3-5 successive generations, and total infertility in 7-10 generations.