Pangram's "Supporting Evidence" feature is misleading and you should ignore it. It's entirely separate from the classifier that determines whether text is AI; it just takes text that's already been classified as AI and looks for some hardcoded AI tells in it. I kind of wish they'd get rid of it, but nontechnical users really like it.

The classifier itself has a very low rate of false positives: https://bfi.uchicago.edu/wp-content/uploads/2025/09/BFI_WP_2...