The right-hand and both-hands distinction is internal to the tradition. Practitioners who work only with the right hand serve, heal, protect and divine; a bòkò who works with both will additionally take payment to injure — preparing an ekspedisyon to send a dead person against someone, or work to break a marriage, ruin a business, or cause illness. Everyone in a locality generally knows who does what, and reputations are made and destroyed on it. The line is genuinely difficult in places, since protection may involve returning something to its sender, and accusations are a currency in local disputes. There is no institution to adjudicate. What the tradition offers instead is a claim about consequence: work done to harm returns to the person who paid for it and to their descendants, which in a system organised around lineage and inheritance is a serious deterrent rather than a pious formula.