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the investigation of criminal activities
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a police investigation to determine the perpetrator
scientific tests or techniques used in the investigation of crimes
the systematic gathering up of suspects by the police
close observation of a person or group (usually by the police)
surveillance by electronic means (e.g. television)
a purposeful surveillance to guard or observe
surveillance of some place or some person by the police (as in anticipation of a crime)
surveillance of disease
the ongoing systematic collection and analysis of data about an infectious disease that can lead to action being taken to control or prevent the disease
the work of inquiring into something thoroughly and systematically
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