Last week, the U.S. Supreme Court agreed to hear the case of Thomas Goldstein, an ex-marine who was convicted of murdering his neighbor.

Goldstein served 24 years before his conviction was thrown out when the main witness against him, a career criminal who was given a deal on his own charges in exchange for his testimony that Goldstein confessed to him in a jail cell, was shown to have lied. Goldstein alleges that the district attorney's office who prosecuted the case routinely used the testimony of so-called "jailhouse snitches" it knew or should have known weren't reliable.

Goldstein's case is unusual because he's suing John Van de Camp, the district attorney who oversaw the office that convicted him. The U.S. Court of Appeals for the Ninth Circuit has allowed Goldstein's case to go forward, setting up the hearing in the U.S. Supreme Court.

The suit stems from federal law 42 U.S.C. 1983, which states that "…[e]very person" who acts under color of state law to deprive another of a constitutional rights shall be answerable to that person in a suit for damages," and provides a means for those wronged by government officials to file suit in federal court.

But there are exceptions to Section 1983 suits...In the case Imbler v. Pachtman 1976, the U.S. Supreme Court carved out a gaping exception for prosecutors. Prosecutors have what's known as "absolute immunity" from civil rights suits, provided they're acting in their capacity as prosecutors. Few people enjoy such protections in their own line of work.

But this complete shield from accountability is especially problematic when we're talking about prosecutors. It's a job that's already plagued by incentive problems—unfortunately, we tend to measure a prosecutor's performance based on how many people he's able to throw in jail, not necessarily by how well he metes out justice.

Rarely, for example, does a prosecutor get public recognition for the cases he doesn't take. So we have people in a position where they have the enormous power to take away someone's freedom, incentives nudging them to err on the side of prosecuting aggressively, and absolute immunity from lawsuits should they overstep their bounds.

It's a recipe for disaster.

Generally, it is smart public policy to shield prosecutors from lawsuits when it comes to determining in which cases they'll pursue charges. If we hamstring prosecutors into factoring potential lawsuits into determining whom to charge, we run the risk of bringing politics or the wealth and status of the accused into what should be a question of law, context, and propriety (any more than these things are already factor into such decisions, anyway).

But, I think you could make a good case that absolute immunity takes this idea way too far. Even police officers are given what's called "qualified immunity" from civil rights suits, which in 1983 the Supreme Court determined meant, "insofar as their conduct does not violate clearly established statutory or constitutional rights of which a reasonable person would have known."

That sets a hurdle for suits against the police, but not a wall. It might be time to consider applying that standard to prosecutors, too.

But the Goldstein case doesn't even seek to overturn the 1976 decision. That would take an act of Congress — and again, perhaps that's something Congress should consider.

Instead, the suit targets Mr. Van de Kamp as the manager of the district attorney's office. It says that he's guilty of negligently overseeing his office, and allowing his subordinates to use unreliable, uncorroborated testimony from prison inmates.

Given the current makeup of the Supreme Court, I'd be pleasantly surprised if they allowed Goldstein's lawsuit to go forward. But they should.

Other legal scholars have suggested that prosecutors should be subject to the less stringent but still protective "qualified immunity" standard when they take on the role of an investigator of fact gatherer — traditionally the role of police — in the course of prosecuting a case.

That's a good idea, too.

There's plenty of evidence that absolute immunity is allowing some prosecutor's offices to run roughshod over civil rights. The New York-based Innocence Project reports that prosecutorial misconduct played a role in about 40 percent of DNA exonerations over the last decade or so. Such misconduct could include knowingly putting on false testimony, withholding exculpatory evidence from defense attorneys, and coercing witnesses, among other transgressions.

I recently reported a case in Reason magazine quite similar to the Goldstein case. In 2006, Church Point, La., resident Ann Colomb, 57, and her three sons were wrongly convicted in federal court of running a massive drug operation out of their home, thanks largely to the testimony of several jailhouse informants.

Despite the fact that the family's home was modest, and that the sons held down several hard labor jobs and went to school during the years of the alleged conspiracy, the government witnesses — who were offered time off from their own sentences in exchange for their testimony — claimed to have cumulatively sold the family some $500,000 worth of crack each month.

The family was released from prison when it was revealed that the jailhouse witnesses in the case had participated in an information sharing network within the federal prison system. Inmates were sharing photos, case summaries, and even grand jury testimony about pending cases, memorizing the information, then offering to testify in exchange for breaks on their own prison terms.

U.S. Attorney Donald Washington's office had been made aware of this network in a prior conspiracy case, yet his subordinates went on to ask some of the same witnesses to testify in the Colomb case. Even after the extent of the network was revealed in the Colomb trial, federal prosecutors attempted to use some of them again in yet another federal drug case.

Ann Colomb now suing Washington's office. Whether her suit will be permitted to go forward may depend on what the Supreme Court rules in the Goldstein case. As it stands, the family is broke from their criminal case. Though they were cleared of all charges, the government has yet to even apologize to them, much less compensate them for the five years they were under suspicion, of the four months they served in prison.

Downgrading prosecutorial immunity would not only go a long way toward puncturing the air of invincibility that pervades some prosecutors' offices, the discovery process in the cases that are allowed to go forward might reveal other cases of misconduct or wrongful conviction.

We shouldn't allow every aggrieved defendant to sue his prosecutor. But in cases where someone is exonerated after being convicted of a crime, where there's clear evidence that something went terribly wrong at trial, and certainly where a single prosecutor has overseen more than one exoneration, allowing civil rights suits against these government officials in their capacity as government employees might shine some needed — if uncomfortable — sunlight on a part of the criminal justice system that has for too long been immune from real accountability.

Radley Balko is a senior editor for Reason magazine and maintains at Web log at TheAgitator.com.