expert, Dr. White. Dr. White testified that medical literature supported this theory. Dr. Sander testified that it was Bill’s activity during fire training school that caused the rupture. He testified that, from a cardiac perspective, Bill had been stable up until the training. He had even had “major abdominal surgery” for colon cancer less than a ye rtise and experience as a cardiologist with an active practice that also continues to teach medical students and fellows on cardiological matters as support for the theory that it was possible for a person to experience increased physical stress, have a continuity of symptoms following that increased physical stress, and have a heart attack over 30 hours later. See Crump, 330 S.W.3d at 215-16 (citing Gammill, 972 S.W.2d at 726-27) (<HOLDING>). When an expert’s experience and training is a
holding that in some cases the relevant reliability concerns may focus upon personal knowledge or experience and that the trial judge must have considerable leeway in deciding  how to go about determining whether particular expert testimony is reliable holding officer could testify based on his training and experience that a defendants actions were consistent with selling cocaine holding that the judge and jury may rely upon common knowledge and experience without proof holding experts experience knowledge and training is considered in determining reliability holding that reliability is the linchpin in determining the admissibility of identification testimony