Answer:
The kind of evidence that Schlosser uses in this passage is anecdotal.
Step-by-step explanation:
Anecdotal evidence is the type of proof that tells stories difficult to verify, difficult to know the context in which they happened (or happen), difficult to evaluate quantitatively as to effect or frequency, etc. In summary, difficult to ascertain the truthfulness. It is the case of "say that said" or "with me it worked".
The anecdotal evidence may even be right. Except that we do not know. Therefore, by itself, it does not serve as proof when we want to construct knowledge in a consistent way in which everything has to be well confirmed.