What affect can social class have on your access to justice?

Most would reason that people with status would never lie because they have much more to lose. In areas of people with high class, the word of a noble is taken as truth compared to one of a peasant. Many court cases, especially back in the day, "justice" is ended with the loss of the lower status member. However, in areas of high poverty with little to no higher class, the rich and noble can be despised. Here, "justice" can take the form of beating and uproars.