Mom sued sued Winnebago County for failing to intervene and protect the boy from violence. The case eventually went to the U.S. Supreme Court, which ruled in 1989 that the County was not liable.
Perhaps this is one reason why social service agencies are still so "incompetent" 25 years later--there is still no real accountability to speak of. Same goes for courts that willfully give custody to abusers even with clear evidence of the abuse before them.http://en.wikipedia.org/wiki/DeShaney_v._Winnebago_County
DeShaney v. Winnebago County
In 1980, a divorce court in Wyoming gave custody of Joshua DeShaney, born in 1979, to his father Randy DeShaney, who moved to Winnebago County, Wisconsin. A police report of child abuse and a hospital visit in January, 1983, prompted the county Department of Social Services (DSS) to obtain a court order to keep the boy in the hospital's custody. Three days later, "On the recommendation of a "child protection team," consisting of a pediatrician, a psychologist, a police detective, the county's lawyer, several DSS caseworkers, and various hospital personnel, the juvenile court dismissed the case and returned the boy to the custody of his father." The DSS entered an agreement with the boy's father, and five times throughout 1983, a DSS social worker visited the DeShaney home and recorded suspicion of child abuse and that the father was not complying with the agreement's terms. No action was taken; the DSS also took no action to remove the boy from his father's custody after a hospital reported child abuse suspicions to them in November, 1983.. Visits in January and March, 1984, in which the worker was told Joshua was too ill to see her, also resulted in no action. Following the March, 1984, visit, "Randy DeShaney beat 4-year-old Joshua so severely that he fell into a life-threatening coma. Emergency brain surgery revealed a series of hemorrhages caused by traumatic injuries to the head inflicted over a long period of time. Joshua did not die, but he suffered brain damage so severe that he is expected to spend the rest of his life confined to an institution for the profoundly retarded. Randy DeShaney was subsequently tried and convicted of child abuse." Randy DeShaney served less than two years in jail. He currently resides in Appleton, WI.
Joshua DeShaney's mother filed a lawsuit on his behalf against Winnebago County, the Winnebago County DSS, and DSS employees under 42 U.S.C. § 1983. The lawsuit claimed that by failing to intervene and protect him from violence about which they knew or should have known, the agency violated Joshua's right to liberty without the due process guaranteed to him by the Fourteenth Amendment to the United States Constitution.
The United States District Court for the Eastern District of Wisconsin issued a summary judgment against Joshua and his mother, who appealed to the Seventh Circuit Court of Appeals. In an opinion authored by Judge Richard Posner, the appellate court affirmed the summary judgment, and the Supreme Court granted certiorari on March 21, 1988.
The court ruled 6-3 to uphold the appeals court's grant of summary judgment. The DSS's actions were found not to constitute a violation of Joshua DeShaney's due process rights.
The court opinion, by Chief Justice William Rehnquist, held that the Due Process Clause protects against state action only, and as it was Randy DeShaney who abused Joshua, a state actor (the Winnebago County Department of Social Services) was not responsible.
Furthermore, they ruled that the DSS could not be found liable, as a matter of constitutional law, for failure to protect Joshua DeShaney from a private actor. Although there exist conditions in which the state (or a subsidiary agency, like a county department of social services) is obligated to provide protection against private actors, and failure to do so is a violation of 14th Amendment rights, the court reasoned "The affirmative duty to protect arises not from the State's knowledge of the individual's predicament or from its expressions of intent to help him, but from the limitation which it has imposed on his freedom to act on his own behalf... it is the State's affirmative act of restraining the individual's freedom to act on his own behalf - through incarceration, institutionalization, or other similar restraint of personal liberty - which is the "deprivation of liberty" triggering the protections of the Due Process Clause, not its failure to act to protect his liberty interests against harms inflicted by other means." . Since Joshua DeShaney was not in the custody of the DSS, the DSS was not required to protect him from harm. In reaching this conclusion, the court opinion relied heavily on its precedents in Estelle v. Gamble and Youngberg v. Romeo.
Rehnquist's opinion stated that although the DSS's failure to act may have made it liable for a tort under Wisconsin state law, the 14th Amendment does not transform every tort by a state actor into a violation of Constitutional Rights. Specifically, the act of creating a Department of Social Services to investigate and respond to allegations of child abuse may have meant that Winnebago County assumed a duty to prevent what Randy DeShaney did to Joshua DeShaney, and failure to fulfill that duty may have constituted a tort.
The court's ruling generated two dissents. The first, by Associate Justice William Brennan, asserted that whether or not the Due Process Clause gave Joshua DeShaney a constitutional right to protection against abuse was a non-sequitur, since it was not an argument presented to either of the lower courts or even to the Supreme Court and "no one, in short, has asked the Court to proclaim that, as a general matter, the Constitution safeguards positive as well as negative liberties."  He went on to say that Rehnquist used a flawed interpretation of the Estelle and Youngberg precedents, which Brennan would hold "to stand for the much more generous proposition that, if a State cuts off private sources of aid and then refuses aid itself, it cannot wash its hands of the harm that results from its inaction."  Finally, Brennan argued that the Wisconsin child-protection laws created a regime in which private citizens and government bodies other than a Department of Social Services had no power or role to intervene with child abuse other than notifying the DSS. As such, Brennan held that the child-protection laws constituted the same custodial "deprivation of liberty" that Rehnquist's opinion held necessary for a Due Process violation.
A second, shorter but more famous, dissent was written by Associate Justice Harry Blackmun, who had (along with Associate Justice Thurgood Marshall) joined in Brennan's dissent. In the first of his four paragraphs, Blackmun reiterated Brennan's contention that there had been state action in establishing a DSS that promised to provide protection against child abuse and absolved all other state and non-state actors of the responsibility or authority to act. He went on to compare the court's ruling to the Dred Scott case, saying that in both cases the court upheld an injustice by choosing a restrictive interpretation of the constitution and then denying that choice.
However, Blackmun's dissent is famous due to its fourth paragraph which is as follows:
"Poor Joshua! Victim of repeated attacks by an irresponsible, bullying, cowardly, and intemperate father, and abandoned by respondents who placed him in a dangerous predicament and who knew or learned what was going on, and yet did essentially nothing except, as the Court revealingly observes, ante, at 193, "dutifully recorded these incidents in [their] files." It is a sad commentary upon American life, and constitutional principles - so full of late of patriotic fervor and proud proclamations about "liberty and justice for all" - that this child, Joshua DeShaney, now is assigned to live out the remainder of his life profoundly retarded. Joshua and his mother, as petitioners here, deserve - but now are denied by this Court - the opportunity to have the facts of their case considered in the light of the constitutional protection that 42 U.S.C. 1983 is meant to provide."
President Bill Clinton quoted the "Poor Joshua!" paragraph in his remarks on Blackmun's resignation, and the DeShaney v. Winnebago dissent was, along with his authorship of the Roe v. Wade decision, the most widely referenced element of Blackmun's career in obituaries following his death. It was also quoted as the headline for Time Magazine's article on the decision. 
^ Supreme Court Syllabus, Opinion, and Dissents
^ Southern Methodist University Law School case brief
^ Court Opinion
^ Opinion of the Court of Appeals for the Seventh Circuit (812 F.2d 298)
^ Dissent by Brennan
^ Blackmun's Dissent
^ Time Magazine, "Poor Joshua!", March 6, 1989