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detecting, detection, detective work, sleuthing
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