The stones have been examined by a number of experts in various related fields over the years, but the most careful and pains-taking examination was by Father Charles Polzer, a Jesuit priest and a well-known ethnohistorian associated with the Southwestern Mission Research Center at the Arizona State Museum. Father Polzer’s work is highly regarded, and he can easily be described as eminent in his field. He reportedly laughed when he was told that the drawings were purported to be more than a hundred years old.
Upon close examination, Father Polzer found that the surface of the stones had been milled with modern machinery before the drawings were inscribed thereon. And he went on to say, "...the drawings were cut into the stones with modern tools. The language and lettering is modern, if somewhat illiterate Spanish, clearly not colonial Spanish. The heart shape drawn on stone #3 is strictly of Northern European or Anglo character; Spaniards never depicted the idea of a heart with this kind of geometry." He went on at length describing more discrepancies, and in the end he concluded that, "...the stone carvings are a hoax of relatively recent origin."
