She served as an expert on the stand in the George Zimmerman trial today... But controversial Medical examiner Dr. Valerie Rao is no stranger in the spotlight. 3 "Because if you look at the injuries, they're so minor that -- to me the word 'slam' implies great force. And this -- the resultant injuries are not great force." Prosecutors in the George Zimmerman trial called a witness to the stand that some would say is somewhat controversial. Channel 4's Scott Johnson joins us live with details of whether a medical examiner's personal and professional baggage could impact this case... Scott? 3 3 07-1235-40 the prosecution's latest witness that could call into question whether george zimmerman was in fact brutally attacked by trayvon martin has a controversial history of her own.dr. Valerie rao is a state medical examiner from jacksonville. and you may have heard of rao. A Channel 4 investigation showed Dr. Rao has received numerous complaints from coworkers dating back years...including having been seen touching cadavers with her bare hands and performing unnecessary autopsies on inmates to create a revenue stream.We spoke with local attorney Gene Nichols who says Dr. Rao's background should not come up in the case. GENE NICHOLS 18:21:55 - we know dr.rao may have been under investiagtion for actions she may have taken, but in a criminal trial, bad acts of an individual rarely get into evidence unless we can show maybe her acts impair her to give testimony in this case. Dr. Rao's testimony does impact zimmerman's claim that he was brutally attacked by trayvon martin that night. Feedback Contact Us Close Item Number: JL-82TU Slug: ZIMMERMAN TRIAL:MED EXAMINER-HEAD SLAMMED?"Dr. Rao, using your definition of slamming, your common understanding of slamming, are the injuries to the back of the defendants head consistent with having been repeatedly slammed into a concrete surface?" "No." "Why not?" "Because if you look at the injuries, they're so minor that -- to me the word 'slam' implies great force. And this -- the resultant injuries are not great force." " What type and extent of injuries would you expect to see if the defendant's head had been repeatedly slammed into a concrete surface?" "So if somebody's head is repeatedly slammed against concrete with great force, I would expect lacerations. I would expect a lot of injury that would bleed profusely that would necessitate suturing and so I don't see that in this picture." when we talked to nichols he added that rao's background should have already been known by both sides and he doesn't expect her credibility to be questioned. 18:22:32 - you would address thos issues before hand. I am sure the state addressed those issues to make sure that the defense did not try to bring up under jury what she may be under investigation for. 3 Scott ....Going forward,...if Dr. Rao - was to be - disciplined in any way regarding these complaints against her, how would that affect the credibility of her testimony?