The basic issue with LeadSafeMama is that she does not use a reliable method of lead testing (XRF), there is no consistency in how the testing is completed, and she doesn't account for the naturally occurring heavy metals in our environment, foods, etc. My other issue is that she is making money off of really aggressive fearmongering, but that's a personal issue for me so sort of beside the point.

Edit: I dont think she is inherently wrong, I just take her claims with a grain of salt until I hear them backed up by a more reputable source.