 Despite such examples of agreement between geological and archeological records on one hand and Native oral records on the other, some scholars have cautioned against the historical validity of oral traditions because of their susceptibility to detail alteration over time and lack of precise dates.The Native American Graves Protection and Repatriation Act considers oral traditions as a viable source of evidence for establishing the affiliation between cultural objects and Native Nations.Oral traditions face the challenge of accurate transmission and verifiability of the accurate version, particularly when the culture lacks written language or has limited access to writing tools.