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Bureau of Justice Statistics
Its mission is to "collect, analyze, publish, and disseminate information on crime, criminal offenders, victims of crime, and the operation of justice systems at all levels of government. These data are critical to federal, state, and local policymakers in combating crime and ensuring that justice is both efficient and evenhanded."
FedStats provides easy access to statistics and information produced by more than 100 U.S. Federal Government agencies.
United States Census Bureau
With these data access tools provided by the U.S. Census Bureau, you can explore a wide range of data about population, demographics, the economy, and more, at the national, state, county, and city levels.
Death Penalty Information Center
Provides death penalty information and statistics by state.
A Broken System: Error Rates in Capital Cases, 1973-1995
"In 1991 the Chair of the U.S. Senate Committee on the Judiciary asked Professor James Liebman of the Columbia University School of Law to calculate the frequency of relief in habeas corpus cases. In late 1995, the study was expanded from a single count of cases and their outcomes to a search for information that might help explain why relief is granted in so many capital cases."