explain why the interrogation process is so important to arrest the correct person for the crime being investigated. In your own opinion, why do innocent people still get arrested for crimes they did

Explain why the interrogation process is so important to arrest the correct person for the crime being investigated.  In your own opinion, why do innocent people still get arrested for crimes they did not commit?

Answer must be  between 400-800 words or 4-6 paragraphs

This is a criminal Justice related question