Nguyen Hong Thuong had been waiting for her turn since 4 a.m. She said it was her fourth attempt to get the verification done. She needs the certificate as she plans to apply for jobs.
"The previous three times there were too many people and the number of tokens ran out," she said. "So this time I decided to come early."
To maintain their reputation and protect their clients' safety, businesses in the service industry, such as tourism and transport, update their employee criminal records every six months.
Government workers switching from one department or division to require verification, as do people who wish to work for foreign employers.