Lab instrument closing before operation in a chemistry laboratory
Scientist holds a chemical sample bottle. Doctor hand in medical glove with clinical chemistry samples putting them to centrifuge
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USA - 1971 - Evidence of drug use is detected by a gas chromatograph in a lab, and an experiment to safely test the effects of drugs on driving is set up.
Concentrated middle-aged scientist examines the chemical liquid in the flask sitting at the table in lab
Male researcher carrying out scientific research in a lab. Flasks with liquids in a lab. Liquid in the flask changes color