My Penn State colleagues looked with horror at the police tape across my office door. I had been opening mail at my desk that afternoon in August 2010 when a dusting of white powder fell from the folds of a letter. I dropped the letter, held my breath and slipped out the door as swiftly as I could, shutting it behind me. First I went to the bathroom to scrub my hands. Then I called the police.
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The Washington Post