Do you not see it firsthand? I should really take a photo of my butcher's sometime. Fresh carcasses hanging, meat being cut off bone etc. You can tell and smell meat buy looking and smelling it.
i am not sure , but i remember him telling me he got a bad batch of meat he had bought off this person before with no problems.
i remember as a kid he would always buy from a butcher, not to many butchers around these days