Reply To: This Beer Predicament

“Assuming that there is a 50% halachik threshold regarding the odds of this “safek derabanan””

Who said this is a derabanan? Ignoring that, I’m not sure you would even go after rov in this case. The beer is in its makom kavua, and you’d be relying on a safek that you can mitigate. If it’s possible for the community to inquire from a local store when they bought their beer (it’s probably even possible for an individual to do this) then you could get rid of the safek.

Also, the “irresponsible position” that you reference is not coming from me, but from several mainstream kashrus agencies.