We might wonder whether we could overcome this first problem by weakening the content element of evidence neutrality. Instead of claiming that if p is part of a subject’s evidence, then her community can agree that p is evidence, the relevant condition could be weakened to the claim that her community can agree that p is true. Although this revised version of the evidence-neutrality principle avoids Williamson’s objection that one is not always in a position to know what one’s evidence is, it faces an objection from Williamson’s anti-luminosity argument. Williamson claims to have established that no nontrivial condition is luminous, where a condition is luminous if and only if for every case a, if in a C obtains, then in a one is in a position to know that C obtains (2000, 95). There is not space here to assess the success of Williamson’s anti-luminosity argument. However, assuming that it is successful, it seems that no mere tinkering with the content element of evidence neutrality will suffice to defend it.I'm just not seeing the problem here. The proposal we're considering is this: any time S has E as evidence, S (and/or S's community) is in a position to know that E is true. But this does not imply that any non-trivial condition is luminous. The claim that evidence is luminous would need knowledge that E is evidence on the right-hand side; the claim that truth is luminous would need no restriction to evidence on the left-hand side. Saying that evidence requires being a position to know truth looks wholly consistent with Williamson's luminosity argument. Indeed, setting aside the role of the community -- which as far as I can tell is idle in the argument Brown is considering -- it follows trivially from Williamson's own view, E=K. Notice that S's knowing that p entails that S is in a position to know that p is true; this is no violation of anti-luminosity.
Anybody see what I'm missing?