A statutory code is a subject-based arrangement of the laws of a general and permanent nature passed by the jurisdiction's legislature. Unlike session law compilations, which are arranged chronologically, codes are well-suited for research because they bring together all of current laws on a given subject in a relatively manageable way.
For example, the United States Code (U.S.C.) is arranged into 54 titles, each covering a broad subject area. Each title is further divided into chapters, subchapters, parts, subparts, and sections, not necessarily in that order. Titles are numbered sequentially, and laws are typically cited by their title and section number (e.g., 18 U.S.C. ยง 2101).
Annotated codes include helpful editorial content such as: references to secondary sources that discuss the statute; references to cases in which courts have interpreted the statute (called Notes of Decision or Case Notes); cross-references to other sections or to relevant regulations; and detailed historical notes.
Unannotated codes simply provide the text of the statute, and thus often are not as useful to researchers as annotated codes. Some unannotated codes (such as the General Laws of Massachusetts) don't even provide references to the enacting session law.
Many jurisdictions have more than one published "version" of their statutory code. The government adopts one that is "official," i.e. it will govern in the event of discrepancies. The official version may be published by the government or a commercial publisher; it varies by jurisdiction. See T1 of The Bluebook for a list of your jurisdiction's available codes. The first one listed is typically the official statutory code.
Key point: the actual statutory text should be the same, regardless of publisher. However, the annotations (e.g., notes of decisions and secondary source references) will differ because they're supplied by different editors. Additionally, officially published government codes, such as the U.S. Code, can be further behind in printing than their commercial counterparts.
BCLR source collection: For law review, use T1 of The Bluebook to determine whether the Westlaw- or Lexis-published code is listed first, and use that platform. It's too burdensome to pull the official print code, so BCLR has decided to use Westlaw or Lexis, as preferred in that jurisdiction.
Federal:
Massachusetts: