The RSPCA is Britain's most prolific private prosecutor, bringing thousands of charges a year on animal-related issues, but Mr Hart argues that its political campaigning, on hunting, for example, has become entangled with its legal activities, and that the two should be separated.

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Lawyers are "encouraged that there's a prosecutor at the helm, not a bureaucrat, " said Stuart Meissner, a former Wall Street prosecutor now in private practice.

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David S. Weinstein, a former federal prosecutor now in private practice in Miami, said it would be easier to prove felony hazing charges than it would be to prove manslaughter.

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White is incredibly accomplished as both a private practice defense lawyer and a prosecutor during her tenure as US Attorney for the Southern District of New York.

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After several years in private practice, Thompson worked as a federal prosecutor.

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"Sometimes agencies overreach their mandate for, inter alia, political reasons, " said Sean O'Shea, a former federal prosecutor for securities fraud now in private practice.

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Sean O'Shea, a former federal prosecutor specializing in securities fraud who now is in private practice, said skepticism about Ms. White's conflicts is overblown.

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At one time after the first conviction, Sollecito's father sought the help of a private lawyer not connected to the case, who spoke to Perugia prosecutor Giuliano Mignini about striking a plea deal to cut Sollecito's sentence in exchange for evidence against Knox.

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David Boies, supreme private-sector litigator, takes on New York Attorney General Eliot Spitzer, consummate prosecutor and politician.

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