According to a report in the Wall Street Journal, "the largest ride-sharing services are now facing a legal threat from regulators on their home turf, a new setback in their race to upend the multibillion-dollar taxi industry. The district attorneys of San Francisco and Los Angeles on Thursday accused Sidecar Inc. of violating California business law and threatened an injunction on its service following a joint investigation." Uber and Lyft also received similar letters. The issue with Sidecar is that it allegedly is misleading consumers about the thoroughness of its background checks on drivers' criminal records and driving records.