From Martin Grimes profile
"Blood that is subjected to dilution by precipitation or other substantial water source prior to drying will soak into the ground or other absorbent material. This may dilute the scent to an unacceptable level for accurate location.It is possible however that the EVRD will locate the scent source as it would for 'dead body' scent."
Brit I haven't seen anything that says that Eddie alerts to bodily fluids. I think it's only Keela.
Want your opinion on the above as i'm not great at putting into words the DNA stuff.
TIA
i think this means eddie was a very clever dog