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This undated photo provided by the Montgomery County District Attorney's Office in Norristown, Pa., shows Richard O'Rourke of Warrington, Pa., a former senior analytical chemist for Merck & Co. charged with causing or risking catastrophe, theft, receiving stolen property and recklessly endangering another person. Prosecutors say O'Rourke stole potassium cyanide from a laboratory at the pharmaceutical firm to use for pest control at home, but poured it down a suburban Philadelphia storm drain Dec. 15, 2017, when he learned there was an investigation. (Montgomery County District Attorney's Office via AP)

This undated photo provided by the Montgomery County District Attorney's Office in Norristown, Pa., shows Richard O'Rourke of Warrington, Pa., a former senior analytical chemist for Merck & Co. charged with causing or risking catastrophe, theft, receiving stolen property and recklessly endangering another person. Prosecutors say O'Rourke stole potassium cyanide from a laboratory at the pharmaceutical firm to use for pest control at home, but poured it down a suburban Philadelphia storm drain Dec. 15, 2017, when he learned there was an investigation. (Montgomery County District Attorney's Office via AP)

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