Stock Photo - 22 September 2020, Lower Saxony, Hanover: Petra Elsner, chemical technical assistant at the State Office of Criminal Investigation (LKA) of Lower Saxony, shows at a press event the evaluation of biological hazardous substances with aM PCR device in a mobile laboratory of the LKA Lower Saxony. Threat letters with poisons, explosives, radioactive radiation: In an emergency, police officers want to know as quickly as possible what they are dealing with. The LKA Niedersachsen manages this with a mobile laboratory. Photo: Julian Stratenschulte/dpa. - Hanover/Lower Saxony/Germany

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