(Bloomberg) — Lyft Inc., Uber Technologies Inc. and Sidecar Technologies Inc. were warned by San Francisco's district attorney they would face legal action if the ride-share services don't change their operations.

According to a copy of the letter provided by Sidecar, the San Francisco and Los Angeles county district attorneys conducted a joint investigation that found the company makes misleading statements on its website about the background checks of its drivers and improperly calculates shared-ride service fares on an individual-fare basis.

Lyft, Uber, Sidecar and other car-booking companies face growing legal challenges as they seek to crack open the U.S. taxi and limousine market, estimated by IbisWorld Research to be an $11 billion industry.

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