consequences including death. i think we ve got to be careful that we don t make that majestic leap to assume this is a knockout drug. reporter: last year, he made comments that 3% mortality due to covid was worth the cost to some to reopen schools. i saw a nice piece arguing that the opening of schools may only cost us 2 or 3% in terms of total mortality. reporter: the backlash was swift and oz later said he misspoke. a 2014 study in the british medical journal found a 40 randomly selected episodes from oz s television show, his health recommendations were based on evidence 46% of the time. here is what we re going to do. reporter: the following year a group of doctors and professors sent this letter to columbia university s dean of medicine, asking him to remove dr. oz who is a trained heart surgeon from his faculty position.