 The debate surrounding this question is analogous to the debates about individual testimony in  Section 2.  On the one hand, Faulkner (2018) defends a qualified Transmission View according to which you can only acquire testimonial knowledge and justification from a group’s testimony that p if that group has, or at least has access to, a body of justification that supports p. On the other hand, Lackey (2014) defends a view that is compatible with a group’s testimony generating knowledge and justification.