There are many ways to detect criminals, some of the ways to detect criminals are:
Interrogation:
One of the ways to know a criminals is to ask them technical questions, then their responses would give you answers regarding their actions.
Observation:
It is very important to me observe the attitude of the person properly, what is another way of detecting a criminal.
This actually means that you have to observe their conduct or actions.
Conversation.
If the environment is safe for you to carry out a wise conversation with the suspect, then ensure that the criminal is without weapons at that moment before carring out a conversation with him or her in order to to get some vital information from him or her.
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