In 1967, Jose L. Lorenzo of the Instituto Nacional de Antropología e Historia claimed that implements had been planted at the site by local laborers in such a way as to make it difficult or impossible to determine which artifacts were discovered in situ and which were planted.
In 1967, Jose L. Lorenzo from the Instituto Nacional de Antropología e Historia claimed that tools were deliberately positioned at the site in a way that made it difficult or impossible to tell which artifacts had been originally present and which were later added.