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It seems to me that a new principle of journalism is required. Sources who claim to be government employees must be identified throughout any story that quotes them by:
1. full name, title, and agency affiliation, or
2. "the whistleblower", or
3. "the anonymous coward"
because there really are no other types of government sources, are there?
These stories about Ivins now are nothing more than scurrilous gossip about evidence that may or may not exist. The gossipers should be named, or at least correctly labelled.
Same rule should apply to employees of government contractors.