U.S. Rep. Rush Holt (NJ-12) succeeded in including language in the 2010 Intelligence Authorization Bill that would require the Inspector General of the Intelligence Community to examine the possibility of a foreign connection to the 2001 anthrax attacks. The amendment was added less than a week after the FBI arbitrarily closed its investigation.

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The Anthrax Attacks Remain Unsolved: The FBI disproved its main theory about how the spores were weaponized.
http://online.wsj.com/article/SB10001424052748704541004575011421223515284.html
The Wall Street Journal - Jan. 24th, 2010