Dr. Martin Tobin Bio, Wiki
Dr. Tobin is a pulmonologist who specializes in the mechanics of breathing. He was one of the first Trial Expert witnesses in Derek Chauvin‘s trial. He presented the prosecution’s first extended testimony on a central question in the murder trial of Mr. Chauvin: how George Floyd died. “You’re seeing here fatal injury to the brain from a lack of oxygen,” Dr. Tobin said.
Dr. Martin Tobin Background
Dr. Tobin was born in rural Ireland, went to medical school in Dublin. He is a physician in pulmonary and critical care medicine at Edward Hines Jr. V.A. Hospital and Loyola University Medical Center in the Chicago area and has been practicing for more than 40 years, but this was his first time testifying in a criminal case.
Dr. Martin Tobin Chauvin Trial
Dr. Tobin said that Mr. Chauvin and other police officers had restricted Mr. Floyd’s breathing by flattening his rib cage against the pavement and pushing his cuffed hands into his torso, and by the placement of Mr. Chauvin’s knees on his neck and back.
The doctor pinpointed the moment he said Mr. Floyd had shown signs of a brain injury, four minutes before Mr. Chauvin lifted his knee from his body.
“The main forces that are going to lead to the shallow breath are going to be that he’s turned prone on the street, that he has the handcuffs in place combined with the street, and then that he has a knee on his neck and then that he has a knee on his back and on his side,” Hines said. “All of these four forces are ultimately going to result in the low tidal volume, which gives you the shallow breaths that we saw here.”
The prosecution has argued that George Floyd died from Derek Chauvin kneeling on his neck for more than 9 minutes. Tobin said he was asked to review medical records and watch videos related to the case. He said he believed Floyd died of a “low level of oxygen” that caused damage to his brain and also led his heart to stop beating.
Dr. Tobin disputed a defense assertion that an elevated level of carbon dioxide found in Mr. Floyd’s blood was the result of fentanyl use, attributing it instead to the length of time he was not breathing before he was given artificial breaths in an ambulance.