One problem is that it may not show up in dead birds in the field because they get weak and picked of by predators.
More Quotes from Jay Roberson:
Mourning doves are ground feeders. They also are sight feeders, picking up visible seeds. They don't scratch or dig. When snow covers a field, they have a hard time foraging.Jay Roberson
We need better information on survival rates and recruitment rates of mourning doves. But we have to look at the availability and efficiency of non-toxic shot.
Jay Roberson
There are some studies going on now in Missouri on penned birds where they were fed a certain number of lead shot. They've found that if they ingest even a small number of shot, they have a very low survival rate.
Jay Roberson
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