Experts say for reform to be meaningful, it must reach the top of law enforcement leadership.

As protesters continue to demand police reform across the United States in the wake of George Floyd’s killing, ethics experts argue police whistle-blowers need greater protection.

In the city of Denver, an internal affairs investigator says she is paying the price for speaking up against police misconduct.

Al Jazeera’s Heidi Zhou-Castro reports.

Watch full video at Al Jazeera.