The prosecution's star witness, whose identity 10News is protecting, broke down on the stand on Friday as she explained why she did not ask a store clerk for help when she said Arevalos led her into a 7-Eleven restroom."I don't know why I couldn't do anything," she said. "I couldn't believe this was happening to me that I was really in a bathroom with a police officer telling me to do these things."The woman is one of seven who have come forward claiming Arevalos pulled her over for DUI and offered to let her go if she "did something" for him.She said Arevalos gave her the option to take off her panties in her own car or inside a 7-Eleven restroom.The woman chose the restroom. Surveillance video shows the two going in together.The restroom is where the woman said Arevalos asked her to take off her panties then touched her intimate areas multiple times and asked to see her breasts before letting her go.Arevalos stared at his accuser as she answered question after question from the defense, who tried to show that Arevalos did not actually force the woman to do anything."You don't say no?" asked Arevalos' defense attorney Gretchen von Helms."Correct," answered the woman."You don't say, 'kiss off' you don't just pull your pants up?" asked von Helms."Correct," answered the woman.In tears, the woman tried to explain why she did not ask anyone for help."It seemed so surreal," said the woman as she choked back tears.Arevalos, 41, was with the San Diego Police Department for 18 years before being fired earlier this year when the charges -- including assault under the color of authority, sexual battery by restraint, false imprisonment and soliciting or receiving a bribe -- were filed.He faces more than 19 years in prison if convicted of 21 felony counts.