Should not a magistrate be not merely the best administrator of the law, but the most crafty expounder of the chicanery of his profession, a steel probe to search hearts, a touchstone to try the gold which in each soul is mingled with more or less of alloy?
There are no more uses of "probe" in the book.
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There was a congressional probe into the scandal.
She probed beneath the gum line as she examined his teeth.