An undercover police officer who testified in the sex trial of former Premier Ewart Brown’s son had her evidence questioned by his defence lawyer this week.Kevin Brown, 40, a physician from Los Angeles, is accused of sexually assaulting a dozen female patients.According to the Los Angeles Times, undercover officer Stacey Young from the Los Angeles Police Department, told the trial that she posed as a patient for a June 2008 undercover operation at the doctor’s practice.Ms Young said he caught her off-guard during an examination when he pulled up her top and exposed her left breast.“I said, ‘Whoa, whoa, whoa! What are you doing?’,” Young testified, adding that she immediately pushed him away.Those words could not be heard in the audio recording obtained from the undercover operation, according to the Los Angeles Times.However, Ms Young maintained she uttered that phrase when Dr Kevin Brown allegedly exposed her left breast.“Are you saying the audio equipment was defective?” defence attorney Edi Faal asked her.She replied: “Yes. We had defective equipment.”According to her, Los Angeles police aborted a planned sting on June 18, 2008, when the audio and video feeds failed.They rescheduled the undercover operation for the next day. On that day, the video feed died a little more than an hour into the visit, but the audio receiver kept recording.The last viewable images were of Ms Young waiting to see Dr Kevin Brown in an examination room.The officer, who has more than ten years of undercover experience, said that subsequent visits to the doctor’s office were cancelled because the alleged incident had a great emotional impact on her.Her testimony in the trial followed that of other women who also claim they had been assaulted or inappropriately touched by the accused when they visited him for treatment.Prosecutors say he assaulted almost a dozen female patients, including the undercover officer, under the guise of unnecessary breast and pelvic examinations beginning in 2003.His 2008 arrest came after several women contacted authorities and accused him of sexually battering or raping them during those examinations, Deputy District Attorney Ann Marie Wise has told the trial.He denies 33 felony sex charges and could face life in prison if convicted on all counts.According to the Los Angeles Times the state is also investigating Dr Kevin Brown in “multiple healthcare fraud schemes and over-prescription of Oxycodone,” according to court documents. He has not been charged in connection with that inquiry.At the time of his arrest, he was on bail for a previous sexual assault arrest.The defendant operated the now-defunct Urban Health Institute of Los Angeles.The charity, which was run out of the same building as his practice, sought to provide disaster relief in the United States, South America and throughout Africa.