Create an InterLibrary Loan/Document Delivery Services account to request books, book chapters or the full text of an article if it isn't immediately available from the library.
The Sentencing Project provides state-by-state statistics on prison populations and sentencing lengths.
This site offers an annual report on drug-related arrests on Native Nations.
This page from the NAACP offers information on prison populations, and a criminal justice fact sheet.
The Congressional Research Service is a "think tank" that provides reports to members of Congress on a variety of topics relevant to current political events. These reports, intended to provide congressmen with an overview of a particular issue, are often brief and may lists of pros and cons. The reports are not comprehensive as not all are available to the public.
From the website: The Sourcebook of Criminal Justice Statistics brings together data from more than 100 published and unpublished sources about many aspects of criminal justice in the United States. Since 1973.
Using a simple keyword search, Google discovers datasets hosted in thousands of repositories across the Web.
United Nations - Office on Drugs and Crime
ICPSR is the world's largest collection of digital social science data.
Note: First-time users will be asked to create an ICPSR MyData account
BJS is the primary statistical agency of the Department of Justice.
Provides datasets that can help guide the exploration and extension of research ideas for topics.