Igros moshe choshen mishpat 1:92 allowed to work for the tax department even though you might have to report a yid cheating, since if you don’t work there a different guy will find the irregularity anyway. Here, too, it’s obvious to the whole world that a car is blocking a driveway.
Same, 1:8: ossur to masser a guy selling neveilos; one of the reasons is that we can’t say that beis din can’t take care of it. Can we say beis din can take care of this, right away? Other reasons to asser there are that punishment by goyishe court is more than beis din…is that true here?
shevet halevi yoreh deah 58. Noch a tax inspector. Muttar since owing the govt taxes is a legitimate choiv, als dina demalchusah, so no problem telling the govt. Ramoh says it’s bad anyway, like hashovas aveidah to a goy, but that doesn’t apply to tax man because it’s to the govt, not a nochri person. Is a fine like that? idk
teshuva of r. elyashiv brought in sefer dvar sinai/she’eilos be’eretz hachayim 45,46—mutar to report theft to police since mesirah only applies where the goyim would treat him harshly, which is not shayech nowadays. Based on panim meiros 2:155. again, is nidon didan like a case of theft or not