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Lexifina maps U.S. Code changes like a git history for lawyers and models
Lexifina said it replayed public-law amendments across U.S. Code release points from 2017 onward so readers can see which act wrote a phrase and when it took effect.
- New headline Was: “Git for US Legislation”
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Lexifina, a legal-research site, said in an Oct. 28, 2026, blog post by Alan Yahya that it has built a versioned history of parts of the United States Code so a reader can pick a date, see the text then in force, and see which public law wrote each phrase1.
Yahya wrote that lawyers usually reconstruct that lineage from amendment and effective-date notes, and that language models doing first-pass legal research often cannot use the proper lineage of a provision1.
Outside titles Congress has enacted as positive law, the Code is only prima facie evidence of the law, and the Statutes at Large govern where the two differ, the post said, citing 1 U.S.C. § 204(a)1.
The Office of the Law Revision Counsel publishes the Code as release points, each current through a named public law, and continues to reorganize it; a bill to enact title 41 as positive law was introduced in September 2025, according to the post1.
Lexifina said that for each pair of release points from 2017 onward it took the public laws enacted in between, carried out their amending instructions on the older text in date order, and compared the result with the newer official version1.
Of 365 changes across nine titles, 361 reproduced the next release point exactly, it said; the other four are labeled by how far they could be confirmed1.
Each change then carries the law and the date it took effect: 261 on enactment by default, 72 by an effective-date note, and 29 by a date in the amendment itself, the post said, with one change left out of the text because it depends on an agency determination that may never come1.
As an example of why dates matter, Yahya walked through the small-business debtor definition in 11 U.S.C. § 1182(1), which rose and lapsed around a $7.5 million CARES Act limit, was restored with retroactive scope in June 2022, and later stood at $3,424,000 after a 2025 adjustment1.
The post cited a 2026 Technical University of Munich paper finding that models answering German statutory questions apply superseded rules or prefer newer text when an older rule still governs the facts, and another 2025 paper finding that models applying amending laws often fail to match official consolidations exactly1.
Lexifina said the history does not yet show a later law's reach-back on earlier dates it covers, so a case filed in a 2022 gap can still show the lower limit without warning that a later act changed the answer1.
Effective-date notes are read by pattern, it said, and unusual wording falls back to the date of enactment; each change links to the law's own words, and the original should be read for anything that matters1.
The company said it is still deciding the form the product should take1.
