In the U.S. most criminal law is enacted and enforced by the states, so you'll find most U.S. criminal law in the individual states' codified statutes (see "State Statutes").
Federal criminal law resides in the U.S. Code (see "United States Code"), particularly Title 18, which covers Federal Crimes and Criminal Procedure. Title 18 includes the Federal Sentencing Guidelines and the Federal Rules of Criminal Procedure (see Federal Procedure Rules).
Pardons: JURIST posts information on U.S. Presidential Pardons including: legal and historical background; regulations and procedures; notable pardons; and a bibliography of books, articles and other materials discussing presidential pardons.
Police Reports: Vehicle accident reports, as well as some crime and incident reports, are available through PoliceReports.US and other commercial vendors. Police reports may also be available through the relevant department's web site (e.g., Toledo), or they may be reported in a local newspaper (e.g., the Daily Chronicle). If nothing else, the department's web site may provide information on how to request a report may be posted on the department's web site (e.g., Philadelphia). Alternatively, you can order Police Reports through Accurint, and they will send a runner to retrieve copeis. Or you can contact the department and request the report yourself.
International Criminal Law: For information and resources, see the International Criminal Law page of the ASIL Guide to Electronic Resources for International Law, Comparative Criminal Procedure: A Select Bibliography (GlobaLex, 2007) by Lyonette Louis-Jacques and/or the International Criminal Law: A Selective Resource Guide (LLRX, 2000).