This photo-enforcement picture released by the Arizona Department of Public Safety, taken in July 2009, shows someone wearing a monkey mask and driving a Subaru belonging to Dave VonTesmar on a Phoenix-area freeway.

Phoenix ? A driver has racked up dozens of speeding tickets in photo-radar zones on Phoenix-area freeways while sporting monkey and giraffe masks, and is fighting every one by claiming the costumes make it impossible for authorities to prove he was behind the wheel.

“You’ve got to identify the driver, and if you can’t it’s not a valid ticket,” said Dave VonTesmar, a 47-year-old flight attendant said.

It took Arizona state police months to realize the same driver was involved and was refusing to pay the fines. By the time they did, more than 50 of the tickets had become invalid because the deadline for prosecution had passed.

Authorities have since stepped up their efforts to ensure that VonTesmar pays his $6,700 in fines.

On Aug. 19, the Arizona Department of Public Safety served VonTesmar in person with 37 tickets, mostly between 11 and 15 mph over the speed limit. The pictures accompanying the tickets show a driver wearing either a monkey or giraffe masks in VonTesmar’s white Subaru, which has black-and-white checkered racing stickers on its sides and a sticker on the windshield that reads “Bucktooth Racin’.”

Agency spokesman Bart Graves also said authorities have surveillance photos of VonTesmar putting on masks before driving and believes that they will convince justice court judges in three area cities that he was the one behind the wheel and must pay his tickets.

“We have pretty strong evidence against him,” Graves said. “We’re just asking for his fines to be paid.”

Graves said VonTesmar has repeatedly endangered public safety and that the agency is taking his case very seriously.

VonTesmar, who said he simply drives with the flow of traffic, said if the Department of Public Safety does have surveillance photos of him on the road, it proves he’s not a danger to other drivers. If he were, officers would have pulled him over, he said.

Arizona began deploying the stationary and mobile cameras on state highways a year ago, and through Sept. 4 had issued more than 497,000 tickets. Of those, about 132,000 recipients had paid the fine of $165 plus a 10 percent penalty, netting the state more than $23 million. Arizona is the first to deploy such technology on highways statewide.