A court asked to apply an Indigenous community's customary law often demands proof resembling proof of a statute: a stable rule, stated in authoritative words, shown to have existed before the dispute. The demand appears respectful because it promises to treat custom as law rather than discretion. In practice, it can distort the object of proof. Many customary systems locate authority not in a canonical verbal formula but in a pattern of relationships, responsibilities, and procedures through which a community resolves particular conflicts.

This does not mean that any current assertion by a community representative should bind a court. Internal disagreement is real, and officials may romanticize or strategically restate tradition. But the answer is better evidence, not a statutory caricature. Courts should examine a range of past decisions, the standing of participants who explain them, the procedures by which dissent was handled, and the degree to which a claimed norm remains embedded in present practice. Variation in outcomes may reflect principled adaptation to context rather than absence of law.

The decisive question is institutional: what makes a proposition authoritative within the legal order being described? If authority comes from a council's continuing practice of hearing affected families and repairing reciprocal obligations, a court falsifies that order when it extracts one sentence from an old ethnography and treats it as a code. Conversely, a court also falsifies the order when it accepts a convenient contemporary pronouncement without asking whether the community's recognized procedures produced it.

Faithful recognition therefore requires a double discipline. The state court must resist translating all law into its own preferred textual form, and it must still test claims of custom against the Indigenous system's own sources of authority. The result may be less tidy than proof of an enacted rule. Untidiness is not indeterminacy, however; it is sometimes the evidentiary price of recognizing a legal form different from one's own.

The evidentiary record should also preserve disagreement rather than compress it into a false consensus. A minority account may reveal how authority is contested and which procedures the community uses to settle that contest. Expert testimony can assist, but an expert's fluency in state-law categories is not a substitute for knowledge of local practice. Written reasons should identify why particular speakers, decisions, and procedures were treated as authoritative. That transparency allows review without pretending that one translated proposition exhausts a living legal order.

The inquiry is demanding, but demanding proof is compatible with respect when the demand tracks the right legal system.