When conducting research on evidentiary issues you will want to start under the Federal Rules of Evidence (known as the FRE). Another place worth looking is under Title 18 Crimes and Criminal Procedures. Part II, Chapter 223- "Witnesses and Evidence" may be especially useful. Title 28 Judiciary and Judicial Procedure may also be of some use. Part V-Procedure of this title has several evidentiary chapters (i.e. Chapter 115- Evidence; Documentary, Chapter 117-Evidence; Depositions, and Chapter 119-Evidence; witnesses)
Title 24 contains the Georgia Rules of Evidence. You can find it at the following links.
The Code of Federal Regulations (C.F.R) is the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. It is divided into 50 titles that represent broad areas subject to Federal regulation. The 50 subject matter titles contain one or more individual volumes, which are updated once each calendar year, on a staggered basis
The Federal Register (Fed. Reg.) is the official daily publication for rules, proposed rules, and notices of Federal agencies and organizations, as well as executive orders and other presidential documents.
Locating foreign primary law on a particular topic can be difficult. The best sources for information on how to research the law of a particular country are:
Legislative history can be extraordinarily useful for determining the intent behind a law, whether you're trying to determine why the law was changed or what Congress meant by a specific phrase. Legislative history is typically found in documents created during the legislative process, including reports, hearings, records of debates, and different versions of the bill.