Techinah for jury duty?

[rhu]

I have jury duty tomorrow. On the off chance that I get impaneled, it just occurred to me that there's probably a techinah out there for asking Hashem that one should rule correctly and that one not accidentally pervert justice. Anyone have a source? I recall something along those lines from Mesechet Berakhot but I may not have time to find it tonight.... And my rabbi is on vacation....