County Registrar Kari Verjil said Burkett dropped off nearly 3,000 voter registration forms a few weeks ago, along with petitions that supported "Jessica's Law," a proposed state initiative that would bar convicted sex offenders from living in many California neighborhoods.
Voting officials immediately noticed problems.
More than half of the forms lacked an identification number, such as a driver's license number, they said.
They also discovered a few people had been registered multiple times, and received one complaint from someone who was not a U.S. citizen and couldn't understand how he could be eligible to vote.
Verjil contacted the district attorney's office and state officials. The county is sending letters to the people on the forms to see whether their registration is legitimate, she said.
Officials with the San Bernardino County GOP said they also noticed irregularities on registration forms, such as repeated names, and had contacted the registrar's office, said Adam Aleman, the executive director.
Burkett billed the party $25,000, which Aleman said would not be paid until the investigations were complete.
The district attorney's office had already been asked to look into possible improprieties in a Rialto signature drive that Burkett led.
About 4,800 of more than 5,600 signatures submitted were found to be invalid and were tossed out by election officials.
A community group called Voice United had hired Burkett's firm to promote a ballot initiative that would have required voter approval for the city to contract with the county to provide city police services.
In Riverside County, Burkett has turned in cards with missing or incomplete information and wrong addresses, said Rebecca Martine, chief deputy registrar of voters.
Residents have also complained that the person registering them incorrectly marked them as a Republican, she said.
"We'll start actually taking a closer look at all the registration cards, whether they're from him or another paid contractor, just to make sure that we're not going to face the same problem," said Riverside County Registrar Barbara Dunmore.
San Bernardino County's investigation comes after an unrelated investigation into possibly fraudulent voter registration cards in Orange County.
Election officials last week turned over 100 instances of allegedly improper voter registration to the district attorney's office in Orange County, including three dozen complaints of Democrats being signed up as Republicans.
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Times staff writers Susannah Rosenblatt and Lynn Doan contributed to this report.
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