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Officials in Boston, New York and other cities have said that in many cases, people with multiple traffic violations continue to make deliveries using accounts registered to others.

The said Thursday it was requiring some drivers to complete real-time identity checks immediately after they complete a delivery. Previously, drivers were occasionally asked to re-verify their identities before or after a shift.

DoorDash has introduced the new system in Los Angeles, Denver, Seattle and other cities, and said it planned a wider rollout next year.

DoorDash said it also has developed an advanced machine learning system that can flag potential unauthorized account access, including login anomalies and suspicious activity. If the company detects a problem, it will require drivers to re-verify their identity before they can .

U.S. drivers must verify their identities with a driver’s license or other government-issued identification, and upload a selfie that matches their identification photo before they can do work for DoorDash. They also must submit to background checks, which require a Social Security number.

The company said it found that some drivers were getting around the requirements by sharing accounts with authorized users. In some cases, drivers who were not authorized to drive for DoorDash paid authorized users for access to their accounts.

Some federal lawmakers have demanded that DoorDash and other delivery apps do a better job of keeping people who are in the U.S. illegally off the platforms.

Republican U.S. Sens. Marsha Blackburn of Tennessee, Mike Braun of Indiana and Ted Budd of North Carolina sent letters to delivery companies in April asking them to crack down on account sharing.

“These illegal immigrants are delivering food directly to consumers’ doors without ever having undergone a background check and often without even using their real names,� the letter said. It added that working illegally can also be dangerous for migrants, creating the potential for exploitation and abuse.

The Associated Press left messages seeking comment Thursday with Gig Workers Rising and Justice for App Workers, which both represent delivery drivers.

DoorDash won’t estimate how many drivers are using shared accounts, but said its safeguards are effective. Last year, it began asking drivers to re-verify their identities monthly by submitting a selfie. The company said it is now asking more than 150,000 drivers to complete selfie checks each week, and it’s removing them from the platform if they don’t comply.