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In page Mummy Juanita:

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As tribute payment, Inca rulers ordered boys and girls between the ages of 12 and 16 to sacrifice. Evidence of strontium analysis suggests that children were taken from several different geographical areas, brought to the Inca capital, and then potentially underwent months of travel to the sacred location at which they would be sacrificed.[1] Archaeologists have discovered through biochemical analysis that coca (the primary source of cocaine) and alcohol were commonly found in the children's systems.[2] Although archaeologists are unsure of why drugs and alcohol were used, some suggest that it was to put the chosen children in a stupor prior to death.[citation needed]