in chapter 18 what can you infer is the reason that Ruth insists that David not plead guilty to a traffic violation? please put a quote

Ruth feels Wilmington is like the South. Whites live in the expensive suburbs while blacks are relegated to the poor inner city. David and Ruth get stopped making an illegal U-turn. Ruth feels like they were racially profiled and dealt with unfairly. You will have to scan the book for your quote.