Cabs wait for passengers at Union Station in Washington, D.C., on May 5. (Nikki Kahn/The Washington Post)

D.C. officials issued 31 tickets over Labor Day weekend for a variety of infractions, including 10 instances in which cabdrivers refused to pick up customers seeking a ride.

Officials from the DC Taxicab Commission sent passengers out through its Anonymous Rider Program. In addition to refusing to pick up passengers, five citations were issued for non-functioning credit-card readers. Other citations included operating an unsafe vehicle, seat belt violations and maintaining improper records.

People who are part of the Commission’s Anonymous Rider Program receive special training and come from a variety of backgrounds. They include African American and white men and women of varying ages, as well as  an individual in a wheelchair and a person requiring the assistance of a seeing-eye dog. During the holiday crackdown, there were no incidents in which drivers refused to transport the person in the wheelchair or the person with the dog.

Note: The use of unapproved devices for credit card payments can result in fines to drivers of $1,000. Drivers who refuse to pick up a passenger, known as “refusal to haul,” face a $500 fine.