Here is what the U.S. Govermnent has to say on the Embassy website:
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Are food and water safe in Japan?
U.S. government experts have met with Japanese experts and reviewed available documents and data from the Japanese food safety system, including Japan’s efforts to protect the food and water supply from radioactive contamination. As a result, U.S. government experts have concluded that the Government of Japan has the resources and technical capabilities to identify and quarantine contaminated food and water before they reach consumers. U.S. government experts also believe that the food safety system is sound and the Government of Japan is taking appropriate steps to ensure the safety of the food and water supply.
How do Japanese standards for food safety compare to U.S. and international standards?
Japan’s established standards for radioactive contamination in food are based on the same target doses for radiological protection as those of the U.S. Food and Drug Administration. Japan’s approach is consistent with international guidance, uses up-to-date radiological risk data, and applies conservative (i.e., protective) assumptions.
How is the Government of Japan protecting the food supply?
Since March 11, the Government of Japan has undertaken to test every category of food in order to make timely and appropriate decisions to ensure a safe food supply. Upon finding any cases of food contaminated above guidance levels, Japanese authorities have taken action by immediately blocking the distribution of that class of food within the affected prefecture. Affected products have been subjected to continuous monitoring and have only been allowed back onto the market when they have passed three consecutive tests.
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Of couse, we can't trust them either, can we?
best,
...............john