>> you've maintained all through this that you didn't kill your child. do you think you're about to be -- get some acquittal there? >> yes, sir, definitely. >> stallings' defense team brings on an expert acceptable to the prosecution. he is dr. pierro renaldo, a world-renowned pediatrician and biochemical geneticist from yale university. renaldo studies ryan's serum and confirms drs. sly and shoemaker's results, that ryan did have mma. he looks for any evidence of ethylene glycol in the sample and lab data, but like shoemaker and sly, finds none. >> the compound being identified as ethylene glycol, it was obviously something else. the data, the evidence was not there, was not credible. and was misinterpreted. >> renaldo is also able to answer the prosecutor's nagging questions.