One thing our modern age has afforded us is the ability to test claimed cryptozoological finds for DNA results. Yet, this brings along with it the issue of how such tests are conducted, by whom, how the samples were handled, etc. For example, advanced in DNA testing have actually led to the release of people who were incarcerated for crimes to which they were tied by the DNA testing of their day.
Thus, from claimed Bigfoot fur to alien corpses: it is all undergoing DNA testing—to whatever degree of legitimacy, and that is the question.