PHOENIX -- A lawsuit could impact thousands of Arizona motorists who have received photo radar tickets.

If successful, motorists who were cited might be able to ignore the tickets, while those who already paid might be able to get their money back, according to a report in the East Valley Tribune.

Legal papers contend the citations issued by Redflex Traffic Systems before the first week in August are illegal, the newspaper reported.

The lawsuit, filed late last month in Maricopa County Superior Court, alleges the company was using radar guns that had not been cleared for use, according to the East Valley Tribune.

Attorney Thomas Moring said his client should be allowed to refuse to pay the photo radar ticket issued by the Town of Paradise Valley in June, the paper said. He was clocked as speeding by a mobile photo radar unit operated for the town by Redflex, the newspaper reported.

Moring said the lawsuit also seeks to block any other state or local government that has issued similar citations from enforcing them, the East Valley Tribune reported.

It encompasses the cities of Paradise Valley, Chandler, Prescott Valley, Tempe and Pinal County and the Department of Public Safety, the paper reported.