Which logical fallacy is used in the text?
I don't trust Professor Silva's findings. Another researcher at her university was caught falsifying data. So, it's likely Professor Silva has, too.

 - guilt by association: a negative association intended to discredit someone or something
 - false dichotomy: an argument that presents only two choices when more options exist
 - appeal to nature: the assumption that natural things are always good
The text argues that Professor Silva's research is untrustworthy because someone else at her university was caught falsifying data. However, this isn't necessarily true. The practices of one researcher at a university do not necessarily reflect the practices of another researcher at the same university. This illustrates a type of logical fallacy known as guilt by association.