When performing security duties, security guards should master the basic methods and techniques for discovering and interrogating suspicious individuals. They are "eight views" and "eight pairs".
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See looks to age
Look career to career
Look at the origin of the accent
See words and deeds to education
Watching clothing and identity
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See peer relationship
Observe differences in behavior and time, differences in behavior and environment, differences in behaviors and situations, and differences in behaviors and goals in order to discover suspicious points and fight crimes.