I have a case involving a drugged driver who wrecks her car. The officer who responds to the scene is just a normal officer who conducts the 3 normal SFST's and then the driver is taken to the hospital after given the choice of being arrested or going to the hospital. Her medical records show positive for Opiates. My question is I have a DRE in the county and I want to use him to talk about the affects these drugs can have on a driver. The DRE actually brought up that he can do what he calls a DRE Reconstruction which is where he would watch the video of the SFST's, look over the medical records, and other evidence in this case such as drugs found in the car, and that he would be able to give his own expert opinion. Does anyone know of any case law that would allow him to testify in that capacity or how I would qualify him to that extent?