Here's an example, and the study cited here has been replicated in many American cities.[0]
For the petty fines and eroded trust, this is from an advisory letter sent from the Justice Deparment to the judiciary of all fifty states:
“Individuals may confront escalating debt; face repeated, unnecessary incarceration for nonpayment despite posing no danger to the community; lose their jobs; and become trapped in cycles of poverty that can be nearly impossible to escape,” Gupta and Foster wrote. “Furthermore, in addition to being unlawful, to the extent that these practices are geared not toward addressing public safety, but rather toward raising revenue, they can cast doubt on the impartiality of the tribunal and erode trust between local governments and their constituents.”
