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In this June 27, 2019, photo, document analysis technician Irvin Rivera collects samples of inkjet printer ink in the International Ink Library at the U.S. Secret Service headquarters building in Washington. The library was recently dedicated to Antonio Cantu, a renowned investigator and former chief chemist at the Secret Service who started picking up samples decades ago. (AP Photo/Patrick Semansky)

In this June 27, 2019, photo, document analysis technician Irvin Rivera collects samples of inkjet printer ink in the International Ink Library at the U.S. Secret Service headquarters building in Washington. The library was recently dedicated to Antonio Cantu, a renowned investigator and former chief chemist at the Secret Service who started picking up samples decades ago. (AP Photo/Patrick Semansky)

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