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During the Cold War one of the greatest security dangers were enemy agents who infiltrated Governmental departments and would pass secure materials to their handlers. The "Canary Test" was a method for discovering these "MOLES".

When a MOLE was suspected in an agency, a memorandum was issued department-wide, with each section receiving the memo with one key datum of their particular copy altered. This was referred to as TAGGING. When our covert agents within the enemy organization monitored the passed information, they would report back which version of the memorandum had been transmitted. This would tell our security people exactly which section of the suspected department has the MOLE in it. This process would be repeated multiple times on ever more refined levels until the MOLE was isolated and positively identified.

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