That's bad business practice. They had no HAACP plan or failed to enforce one. The reason why they had to recall so much is not because it has been contaminated, it's that they have no way of knowing if it has or hasn't. It's a huge problem that could have been eliminated by keeping weekly records, or god forbid, daily.

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You don't need a weatherman to know which way the wind blows - Robert A. Zimmerman