I'm not the GP, but here are some ways:

Something like 95% of criminal cases are resolved with plea deals and not trials, and legal representation from public defenders has very limited resources.

Cash bail results in many people imprisoned without trial: After arrest, the court requires bail. Poor people can't afford it, so they are jailed until trial, which can be over a year. The impacts go beyond the (very serious) loss of freedom: They lose jobs, their family loses income, dependents (children, elderly) lose caregivers.