San Antonio police want to know if it's happened before.
They say Officer Jackie Len Neal pulled over a 19-year-old woman during a traffic stop last week, handcuffed her, placed her in the back seat of his patrol car and sexually assaulted her.
Neal, police said, was on duty at the time, in a marked police car and wearing his uniform.
Another woman made a similar outcry about Neal a few years ago but refused to testify, Police Chief William McManus told reporters. He said the department will reach out to her again.
"Given what we have now, I don't know how that will work out, but I'm going to ask we do that," he said.
He also urged any other possible victims to come forward.
Neal, 40, is an 11-year veteran of the force. He has also been disciplined for violating department policy by dating an 18-year-old woman in the Explorers program, the police chief said. The program introduces young people to careers in law enforcement.
"I'm angry," McManus said of the arrest. "I'm outraged. It's a punch in the eye to the police department."
Last week's incident took place late Friday night.
The on-board cameras in Neal's vehicle were not working. But GPS showed his police cruiser was stopped at a particular spot for 18 minutes. It's the same spot that the victim alleged the assault took place.
Neal was charged with felony sexual assault, and was out on bond Monday. He has been placed on paid administrative leave, as per department policy.
CNN could not reach Neal for comment, and could not ascertain whether he has retained a lawyer.
-- CNN's Adam Shivers contributed to this report.
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