criminal justice policy

Four questions article link provided 

 http://www.antoniocasella.eu/nume/Andrews_Bonta_Criminal_Justice_Policy_2010.pdf 

1)  Describe the relationship between criminal justice policy and practice.

2)  Can criminal justice be effective without policy?  Explain your answer.

3)  What are some of the key factors governing the development of Criminal Justice policy?

4)  Are currently policies effective at controlling crime?  Explain your answer.