Decode

Every claim must trace back. Untraceable = first-class failure.

Claim text

"A state law that discriminates against interstate commerce on its face is virtually per se invalid."

↓ source

Provenance

source_case_id: city-of-philadelphia-v-nj-1978
source_excerpt: "[quoted passage from opinion, char_span 4128–4244]"

↓ chain

Edge chain

chain: [
  city-of-philadelphia-v-nj-1978 → pike-v-bruce-church-1970   : cites,
  pike-v-bruce-church-1970       → hughes-v-oklahoma-1979     : cites,
  hughes-v-oklahoma-1979         → granholm-v-heald-2005      : affirms
]

If null —

If source_case_id is null, the claim lands in truth_unit.untraceable_claims.

That field is counted, displayed, and gated. > 0 untraceable claims is one of the four pass-criteria failure modes.

Decode (P5.1) is the only pipeline step pinned to Opus — no cheap-engine substitution allowed. This is the integrity surface.