The answer is innocent

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Across
  1. 2. a hint that detectives look for
  2. 3. a person who suffers harm or death as a result of a crime
  3. 5. an illegal act
  4. 9. proof of innocence
  5. 10. proof for prosecution
  6. 12. the deliberate unlawful killing of someone
  7. 13. something unsolved
  8. 14. science for crime
  9. 16. detailed examination of something
  10. 19. bodily fluid mark on the ground
Down
  1. 1. close observation of a suspected criminal
  2. 4. reason behind a crime
  3. 6. unique identifier
  4. 7. crime solver
  5. 8. post-mortem examination to discover cause of death
  6. 11. a formal verbal or written statement given in the court of law
  7. 15. one who saw it happen
  8. 17. where the crime took place
  9. 18. person under investigation