Service in coca and indigo (Recopilación, libro VI, título 14)

Three laws on the two American crops the crown judged most dangerous to the people who grew them. Coca is not banned — the king refuses to take from the Indians "este género de alivio para el trabajo, aunque solo consista en la imaginacion" — but is put under an ordinance of dry clothing, rations, salaried surgeons, wages paid to the worker and not the cacique, and no loads carried on backs to Potosí. Indigo work is forbidden outright, even to volunteers.