Reading the June 2026 CFTC NPRM through the five failure modes

The CFTC's NPRM, 'Prediction Markets; Public Interest Determinations,' was published in the Federal Register on June 12, 2026 (91 FR 35806); comments are due July 27, 2026. It proposes to formally permit sports OUTCOME contracts while disallowing single-play props, injury markets, officiating-call markets, pre-collegiate markets, and pure-luck games. Read it as a drafting standard, not just a list: the disallowed families are precisely the ones whose resolution is hardest to make unambiguous.

That maps cleanly onto the five failure modes Brierly grades. Outcome contracts ('who wins the match,' 'who wins the tournament') resolve on an official, canonical result — low source-dependence and low definitional-vagueness. The disallowed families invert that: an officiating-call market is pure definitional-vagueness and disclosure-timing (what counts as the call, and when is it final after review?); an injury market is source-dependence (whose injury report, and is 'questionable' an injury?); a single-play prop multiplies scalar carve-outs and timing edges across every snap.

The practical takeaway for the ten pending DCM applicants: the contract-universe audit the comment window rewards is the same exercise RuleScore performs — classify each planned listing by how its resolution can break, not by which league it references. A listing set that scores well on source-anchoring and definitional precision is also the set most defensible under the proposed permitted-set language.

Brierly's comment on the empirical record (the coded dispute database, dollar-weighted by failure type) is in preparation for the public docket before the deadline. The five failure types in our methodology line up with the disclosure questions the proposal raises; we will cross-link the filing here once it is public. Informational only — not legal advice.