Preemption Check (ylj-preemption-check)

In legal academia, preemption means someone already published your claim. A YLJ piece that repeats an existing argument is dead on arrival — student editors and the faculty they consult are reading the same SSRN feeds. This skill runs the search systematically and turns the result into the manuscript's "what's new" paragraph. It assumes the claim is already sharp (ylj-thesis-and-contribution).

When to trigger

• The thesis is sharp and you must confirm no one has made it
• A reviewer/colleague says "didn't so-and-so already argue this?"
• You are about to write the "contribution" paragraph of the introduction
• You need to distinguish your claim from a close existing piece, not just confirm absence

The four-database sweep (do all four; log each)

Search the claim, not just the topic: combine your novel move with the doctrine (e.g., the specific mechanism + the specific area), because the topic is crowded but the claim may be open.

Classify each near-miss

For every close piece, decide which applies — and say so explicitly in the draft:

• Different claim — same topic, different argument → cite and move on.
• Same claim, narrower — they did one circuit / one statute; you generalize → frame as extension.
• Same claim, different ground — they argued it on policy; you argue it on text/history → frame as a new justification.
• Genuinely preempted — they made your exact move → change the claim (back to ylj-thesis-and-contribution), do not paper over it.

Near-miss ledger

Do not rely on memory after the search. Build a ledger for the closest sources and use it as the validation record for the contribution paragraph:

Validation rule: the "what's new" paragraph is not ready until the closest near-miss can be described fairly in one sentence and the piece's added move is different enough that a skeptical student editor would not call it a relabeling.

Write the "what's new" paragraph

Output a paragraph that (1) names the closest prior work, (2) states precisely what it did, and (3) states what your piece adds that it did not. This becomes the contribution paragraph student editors look for first.

Checklist

• All four sources searched on the claim, not just the topic
• SSRN checked for unpublished work in the exact subfield (highest risk)
• Each near-miss classified (different / narrower / different ground / preempted)
• No "genuinely preempted" survivor — if found, claim revised
• "What's new" paragraph drafted, naming the closest prior work explicitly

Anti-patterns

• Searching only the topic, declaring novelty, and missing a same-claim SSRN draft
• Ignoring an SSRN working paper because it is "not published yet" (editors read it anyway)
• Burying a close competitor in a string cite instead of distinguishing it head-on
• Overclaiming "no one has ever" when a foundational HeinOnline piece said something adjacent
• Reframing as novel a piece that is actually preempted — student editors will find it during source-pull

Output format

【Claim searched】the exact sentence searched, not just the topic
【Sources swept】SSRN / Westlaw / HeinOnline / Scholar (all four? Y/N)
【Closest prior work】author, venue, what it did
【Relationship】different / narrower / different ground / PREEMPTED
【Ledger】search strings + near-miss classifications recorded? Y/N
【What's new】one-paragraph contribution statement
【Next】ylj-argument-structure (or back to ylj-thesis-and-contribution if preempted)

Supplementary resources

• ../../resources/external_tools.md — SSRN / Westlaw / HeinOnline / legal-research access notes
• ../../resources/official-source-map.md — YLJ originality / anonymized-review facts