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The first lie detectors 1. ____________________ (use) in the nineteenth and twentieth centuries, while the modern lie detector, which

2. ____________________ (call) a ‘polygraph’,
3. ____________________ (invent) in 1990. During the process of lie detection, body reactions
4. ____________________ (measure). The use of detectors

5. ____________________ (criticize) for many years, so in future they will not

6. ____________________ (allow) in many countries.