National Geographic: "Inca Child Sacrifice Victims Were Drugged"

Some amazing data using hair follicle tests 

(don't know if the narrative is correct, up to the domain of other experts, but the biological data is definitely interesting)

"Mummy hair reveals that young victims were heavy users of coca and alcohol"

 Tests revealed that this sacrificed 13-year-old used coca at a high level during the last year of her life, but her alcohol use surged only in her last weeks.

Photograph courtesy Johan Reinhard

From Nature on the same subject:
http://www.nature.com/news/incan-child-mummies-show-evidence-of-sacrificial-rituals-1.13461

From Archaeology.org:
http://www.archaeology.org/news/1136-130730-argentina-llullaillaco-maiden-coca-alcohol