If Grime had done his job properly, Eddie would have tested the coconut shell in an area free of pre-exisiting odours.
It was only after Eddie alerted to the area in question that Martin was informed that bones had previously been found and binned by workmen before the concrete was laid in that area It was only when the area was dug that the woman scientist whose name evades me right now spotted the 'coconut' and picked it up and examined it.
I fail to see how you can accuse Martin of not doing his job properly.
As I said, I have my doubts about it being coconut but can you tell why you do not understand that it is the odour the dog alerts to, not the material on which the odour is deposited.
I repeat for clarification purposes:
'coconut husk is wood and wood will absorb odours. If the husk was in the presence of human remains material for years it will actually build up and retain large amounts of odour as a cumulative effect. The fact that the coconut is not human does not matter. It's the odour the dog alerts to, not the material on which the odour is deposited.'