The International Agency for Research on Cancer notes "a complete absence of reproductive studies, developmental data, and studies of the safety of melamine in cases of human exposure."
This in a letter [1] to new "food safety czar" David Acheson requesting "all Agency analyses and records of deliberation" leading to its conclusion that melamine presents no risk to humans. Will Acheson respond? Watch this space.
Links:
[1] http://www.ewg.org/issues/toxics/20070504/index.php