More than 4,000 combinations have been barred from license plates in the state, including "FBI" and "CIA," which the administration said carry a "fraudulent or deceptive purpose," The Baltimore Sun reported Tuesday.
The agency said it also bans plates that can be construed as sexual, scatological, profane or insulting. Combinations appearing to convey messages about a group's race, ethnicity, religion, sexual orientation or disability are also banned.
Philip Dacey, an official with the MVA, said the administration sometimes receives a tip-off about something officials may have missed from the prison inmates who make the plates.
"Sometimes they'll be quality control," Dacey said. "They'll call us and say, 'Hey, this combination is a drug reference or a sex reference.'"