What are the four perspectives that traditionally define the reasons and methodology of surveillance?

2.What are the legal issues related to surveillance?

3.What is the current legal status of wiretapping in the United States?

4.What is a "mail cover"?

5.What is the current legal status relating to the use of visual and sound enhancement devices?

6.What is "loose surveillance"?

7.What is "close surveillance"?

8.Explain "stop and frisk" as a police technique.