Once a FOIA request is received, MSHA has 20 working days in which to make a determination on the request. In "unusual circumstances," an agency can extend the twenty-day time limit for processing a FOIA request if it tells the requester in writing why it needs the extension and when it will make a determination on the request. The FOIA defines "unusual circumstances" as (1) the need to search for and collect records from separate offices; (2) the need to search for, collect, and examine a voluminous amount of records "demanded in a single request"; and (3) the need to consult with another agency or two or more agency components.
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