Contamination" is when you mention the spyraker that brought the subject matter up to you when you were not being eavesdropped on. "Cakes" are fun stuff for these people. But "pies" are very bad, because "P.I.E." Means "PRINCIPAL INVESTIGATOR EXECUTED."
True story bro. Welcome to Obamas police state.
You can put listening devices ANYWHERE now, cheap. And they are tiny.