Science: Poisoners Beware

Ever since January, the Paris police have felt sure that mousy Dr. Jean Duflos is an unimaginative, old-fashioned poisoner and that he killed his wife with arsenic. They arrested him on the way to her funeral, but for a clear cut case, they needed to know exactly when the poison was given—the one thing their toxicologists couldn't tell them. The body, which tries hard to protect itself from arsenic, stores it away in the skin, fingernails and hair. But even after examining hundreds of samples of such clues, toxicologists can seldom do more than report approximately when the poison dose was...

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