The question stops Bart in his tracks, and he has to consider that for a long moment. He... hadn't actually thought about that. Oh no.

"I'm...not actually sure," he admits, clearly worried. He looks back at Leon as his thoughts run along similar lines. "If it helps at all, I haven't actually seen evidence of lead poisoning in the records that were copied over from the first clinic. I went through a lot of them when I first signed on as an assistant to be able to address some issues that could benefit from a more advanced perspective." He's done a lot of work in trying to get some of their resident doctors a little more up to speed in the hopes of preventing unintentional malpractice.