Ummm...I have a problem with one of the central points in the article. It said that lead ammunition is designed to spread/break apart when hitting a target animal...and therefore an eagle that consumes a dead animal may ingest lead, etc.
Short version...that really isn't the case. Virtually every rifle/gun cartridge/bullet that exists is designed to remain intact and "mushroom" upon impact. While there may be trace elements left in the meat, it would be miniscule at best.
Therefore, I question the conclusions of this "study", as that is a pretty big flaw IMO. Now then...if someone told me that there was a reason to think that eagles are ingesting some lead due to sinkers used in fishing, etc, I think that would be a possibility worth exploring.
But eagles getting lead from eating deer, etc, that have been shot and not found...yeah, not feeling that.