only if the state court does not hold a certain proceeding within a certain time), or, far less frequently, resolved favorably to the prisoner on the merits outright. About 57% of habeas corpus issues dismissed on procedural grounds in 1992 were dismissed for a failure to exhaust state remedies. Success rates are not uniform, however. James Liebman, Professor of Law at Columbia Law School, stated in 1996 that his study found that when habeas corpus petitions in death penalty cases were traced from conviction to completion of the case that there was "a 40 percent success rate in all capital cases from 1978 to 1995." Similarly, a study by Ronald Tabek in a law review article puts the success rate in habeas corpus cases involving death row inmates even higher, finding that between "1976 and 1991, approximately 47% of the habeas petitions filed by death row inmates were granted." Most habeas corpus petitioners in death penalty cases are represented by attorneys, but most habeas corpus petitioners in non-death penalty cases represent themselves. This is because federal funds are not available to non-capital state habeas petitioners to pay for attorneys unless there is good cause, there being no federal right to counsel in such matters. However, in state capital cases, the federal government provides funding for the representation of all capital habeas petitioners. Thus, about 20% of successful habeas corpus petitions involve death penalty cases. These success rates predate major revisions in habeas corpus law that restricted the availability of federal habeas corpus relief when AEDPA was adopted in 1996, over a decade ago. Post-AEDPA, the great disparity in success rates remains, however, with the federal courts' overturning of state capital cases a major reason that many states have been unable to carry out a majority of capital sentences imposed and have long backlog lists. Disposition time The time required to adjudicate habeas corpus petitions varies greatly based upon factors including the number of issues raised, whether the adjudication is on procedural grounds or on the merits, and the nature of the claims raised. In 1992, U.S. District Courts took an average of two and a half years to adjudicate habeas corpus petitions in death penalty cases raising multiple issues that were resolved on the merits, about half of that time-length for other multiple issue homicide cases, and about nine months in cases resolved on procedural grounds. AEDPA was designed to