RollCall

The mechanism inverts: the same physics that makes robots exceptional RF subjects makes them indistinguishable from one another. A large metal chassis's return is dominated by pose, aspect angle, and the multipath geometry of the moment — within-unit variance across passes exceeds between-unit variance across a homogeneous fleet, so the learned 'fingerprint' identifies the trajectory and the room, not the machine. Two independent kills. First, warehouse baselines are perishable: every pallet moved rewrites the static multipath any signature is conditioned on, so a fingerprint library decays in days and degrades silently into confident misclassification — the worst failure mode an evidence product can have, because it does not know it is wrong. Second, band rule R-A2 bars robot identity from RF alone outright: a witness plane that guesses identities poisons every certificate downstream, and one wrong roll-call entry forfeits the whole ledger's credibility the moment a dispute tests it. Drive-EMI 'fingerprints' die the same way — the ISM floor is the most confounded spectrum in the building and carries no direction and no attribution. The salvageable sliver already ships elsewhere in the band: positional-temporal correlation with the declared plan. In a sparse scene, one robot declared in one zone at one time is attributable by exclusion, stated as correlation with its uncertainty attached, never as recognition — and that sliver is load-bearing in the flow map and misplacement rows, which is where it belongs.