I mean, there were once poll taxes and literacy tests, which were discriminatory. But how would one test for skeptical rationality? And how would that ever get implemented in a populist democracy?
An indirect approach could be to figure out if sensitivity to fake-news/populism/echo-chambers correlates with other behavior, allowing you to select.
For example, suppose that a correlation exists with short-term greediness. In that case, you could alter the voting process such that the voter can choose between a small reward or voting.
This could also be justified by saying that politics should not lean towards short-term policies, and hence people who are prone to such thinking should not participate in the voting process.
Doing that for the politicians might be a better idea there. Too many MPs and Congress members only think about the short term effects of their policies as is, and it's certainly causing issues in the political world at the moment.
I mean, there were once poll taxes and literacy tests, which were discriminatory. But how would one test for skeptical rationality? And how would that ever get implemented in a populist democracy?
Edit: typo