could be declassified? IF Plame's status as an active covert operative was declassified, there's a procedure that also includes the department/agency involved to present why or why not the information should be declassified. It's not a simple process, and involves several steps before it can be signed by POTUS to be declassified.
There HAS to be documentation to PROVE this information was declassified and WHEN!
http://tinyurl.com/ne43w(This is the HTML version of a .pdf)
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B. Our nation’s democratic principles also require that the American people be informed of the activities of their Government; therefore, information may not be classified unless its disclosure reasonably could be expected to cause damage to the national security. If there is significant doubt about the need to classify information, the information shall not be classified. If the classifying authority has a significant doubt about the appropriate level of classification, he or she will classify the information at the lower level. In addition, classified information shall not be declassified automatically as a result of any unauthorized disclosure of identical or similar information.
C. The authority to classify original information at the Secret or Confidential level may be exercised only by the Secretary of Commerce and officials to whom Original Classification Authority (OCA) has been delegated. No departmental official is authorized to classify original information at the Top Secret level. Officials authorized to classify information at the Secret level are also authorized to classify information at the Confidential level.