Dr. Martin Tobin, a pulmonologist who testified as an expert witness for prosecutors, returned to the stand on Thursday during rebuttal, telling jurors that previously shared data showed George Floyd's level of carbon monoxide was "within the normal range." #News #Reuters #GeorgeFloyd #DerekChauvin #MartinTobin Subscribe: http://smarturl.it/reuterssubscribe Reuters brings you the latest business, finance and breaking news video from around the globe. Our reputation for accuracy and impartiality is unparalleled. Get the latest news on: http://reuters.com/ Follow Reuters on Facebook: https://www.facebook.com/Reuters Follow Reuters on Twitter: https://twitter.com/Reuters Follow Reuters on Instagram: https://www.instagram.com/reuters/?hl=en