Full Idea
Advocates of the defeasibility theory have tried to exclude true pieces of information that are misleading defeaters.
Gist of Idea
Defeasibility theory needs to exclude defeaters which are true but misleading
Source
Thomas Grundmann (Defeasibility Theory [2011], 'What')
Book Reference
'Routledge Companion to Epistemology', ed/tr. Bernecker,S/Pritchard,D [Routledge 2014], p.157
A Reaction
He gives as an example the genuine news of a claim that the suspect has a twin.