State and federal criminal codes are available in annotated (containing editorial notes and research references) and unannotated (text of the law only) versions. Each federal and state code set has an index. To locate relevant statutes, choose one of the annotated codes and search its index for your keywords.
FEDERAL STATUTES
United States Code - Official, unannotated version. Title 18 covers federal crimes & criminal procedure; it includes the Federal Sentencing Guidelines & the Federal Rules of Criminal Procedure.
Also available online at GPO's FdSys (free)
Also available on Westlaw and WestlawNext
Also available on Lexis and Lexis Advance
STATE STATUTES
To find statutory codes for individual states, visit Lexis or Westlaw. Current, official, unannotated versions may also be found on state legislatures' websites.
The Law Library has some state codes in print. Check NUCAT or ask a librarian.
Massachusetts' code may be found here:
Also available (unofficially) online from the Mass. Legislature
Also available on Westlaw and WestlawNext
Also available on Lexis and Lexis Advance
For comparative state laws on crimes, consult:
Full text also available via HeinOnline (research database)
FEDERAL CASES
STATE CASES
West's Massachusetts Digest, 2d