When do you think the prosecutor's office should become involved in a case (pre-arrest or post-arrest)?

Question

Do you think involvement by a prosecutor in the original stages of an investigation is a good idea?
Can a defense attorney ever become involved in a case prior to indictment or arrest?
When does a judge or magistrate's function begin? In addition, briefly discuss the sources of criminal law.
How does constitutional law affect the development of the criminal code?
What are common law crimes as opposed to actions criminalized by statute?

Since this is not my area of expertise, I searched Google under the key words "prosecutor function" to get these possible sources:

http://darwin.nap.edu/books/0309075610/html/1.html
(Broken Link Removed)
http://www.abanet.org/crimjust/standards/pfunc_blk.html#1.2
http://www.njlaws.com/prosecutor_not_advocate.htm
http://darwin.nap.edu/books/0309075610/html/29.html

I hope this helps. Thanks for asking.

Answer 1

When do you think the prosecutor's office should become involved in a case (prearrest or postarrest)?
* Do you think involvement by a prosecutor in the original stages of an investigation is a good idea?
* Can a defense attorney ever become involved in a case prior to indictment or arrest?
* When does a judge or magistrate's function begin? In addition, briefly discuss the sources of criminal law.
* What career options do you see in this case? Would you be interested in one or several career options? Why?