It's worth mentioning that prosecutorial immunity, a form of qualified immunity, is a relatively recent creation (20th century, possibly as recent as Bivens v. Six Unknown Named Agents[1], 1971), and not the eternal concept some portray it as.

More on this: http://www.section1983blog.com/2009/09/brief-summary-of-pros...

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Notes:

1. http://en.wikipedia.org/wiki/Bivens_v._Six_Unknown_Named_Age...