Many ND'S do reccommend liver flushes. Dave Frahm ND is one of the ones that do and has it in a published book. It's a different protocol but there are plenty that do. Dave Frahm has several people, mostly very sick, attend his 8 day lodge sessions several times a year and they all do liver flushes.
You can look him up on the internet - http://www.healthquarters.org
- he has a tremendous amount of information at the web site in the archives of newsletters and he writes in an easy to understand language. It's free.