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 asserted that tools had been strategically positioned at the site in a way that made it difficult or impossible to distinguish between artifacts that were originally present and those that were later added.