According to the CDC, "No safe blood lead level in children has been identified. Even low levels of lead in blood have been shown to affect learning, ability to pay attention, and academic achievement. ", so there's no acceptable dose of lead if it is ingested.
Being sure that there's no issues without having done the research is just as ignorant as someone who panics without having done the research. If I'm concerned about something, you can be sure I will read everything to see if it is an actual issue or not.
