Oldest known evidence of Trichocereus usage

[Nezahualcoyotl]

I am looking for the oldest known evidence of "San Pedro" (Trichocereus) usage by humans.

 

What are the oldest sites/evidence you know about? 

[Evil Genius]

This is the second time I am removing this and if I have to do it a third time I´ll find a more creative way to deal with this. It´s about consumption, so it´s against the rules.