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If you're fatally allergic to penicillin, wear a Med-Alert bracelet. Never FedEx beta software without removing the visible backdoor to your company's ultra-secret network. A Lexicon of Inconspicuously Ambiguous Recommendations Robert J. Thornton Letters of recommendation are becoming increasingly unreliable as a means of evaluating candidates for employment. The chief reason is that the contents are no longer strictly confidential. In all but the rarest of cases a letter is apt to be favorable, even when the writer knows the candidate is mediocre or unqualified.