the nhs in the u.k. did a large two-year plus study and they concluded at the end of that study which came out a couple months ago that this is not the sort of thing where there is good evidence of safety. now, people have said because we don't have long-term evidence we can conclude it is safe. the absence of evidence is not evidence of absence. a lot of doctors, especially practicing physicians, are saying look, this is not ready for prime time. not the u.k. seined, finland, norway, france are moving toward more caution on this topic. the tide is starting to turn. it is okay to ask questions. we need more people to do so. >> bill: just need a quick answer. politics involved some believe it's driven politically. do you? >> there is a lot of politics in our professional medical associations now and very concerning for the scientific method. >> bill: nice to see you on this friday. thanks for coming on. dana. >> dana: breaking news out of memphis, tennessee, three police officers wounded in an early morni