The author, perhaps the nation's top authority on prosecutorial misconduct, raises and analyzes two questions: Why does this misconduct occur? (It often pays off.) And why does it continue? (There are no effective sanctions.)
Bennett L. Gershman, Why Prosecutors Misbehave, 22 Crim. L. Bull. 131 (1986), http://digitalcommons.pace.edu/lawfaculty/540/.