Chicago police and the secretary of state's office checked 22 cars, issued four citations and confiscated three placards.
This was just the latest in a series of stings that began in August.
A new state law increases the penalties for violators.
Secretary of State Jesse White says drivers cited for a third offense could have their license revoked.
Police say one woman cited Friday said she was having car trouble.
"I believe it's a violation of all laws of human decency for an individual to take advantage of a program that was set aside for those who are truly in need," said White.
Police say they think drivers are getting the message, but enforcement efforts will continue.
