Hi Jo,
Bags of obiedience is called for. One of the 'Ability Practical Tests' on the LSDogs standards is the ability to stop/recall your dog.
Much to the anoyance of others I test this by setting up a seen runaway or throwing a ball/toy I have wound the dog up with first. The dog is sent after it/them and the dog is commanded to stop/recall. This test shows whether the dog can be called off something they want, very similar to the police GP dog tests. They have to release a dog onto their criminal and then stop the dog before it bites.
With regards to using cadaver dogs in graveyards I'm not sure to be honest. I know that in the US they train on porper fields, but that isn't to say that you couldn't I suppose. Perhaps Mike (the badger head) could shed some light on this as a (new PC term) 'Victim Recovery Dog' handler.
Over to you Mike................
Hope this helps.
Pete.