Don't you mean 'medicine is not a science'? It is certainly not contested at all that science is a medicine. Regarding medicine being a science, it is also not contested in any way, at least by scientists (or by sensible medics - albeit not all are sensible and some advocate 'alternative' ways...
To be fair, this isn't 'science'. It is medicine (which is NOT a 'science') and the laws, both of which, as you say, are open to interpretation. Science, by contrast, is a method of examining a hypothesis....