"I don't know if we could get a sample," Kevin said, brow furrowing. "I mean, a blood sample, maybe... from someone who was under it? But I wouldn't know how to separate it out, or anything. Or even take a blood sample, for that matter." He wasn't too worried about that, though. "But if it is a potion, and they're being force-fed it, they should come off it eventually, right? Or is it a one-time dose thing? I don't think there are potions that last forever."
He was beyond excited to be helping, to be doing something, and especially to have new information! It was so exciting to know that he'd been so close in his guess about what had been happening to everyone, he could barely keep it inside.
"How does the coin work?" he asked curiously. "Because we should be careful about the ones under the slime juice, remember? I was thinking I should go into the wizarding world in disguise and try to track people down, feel 'em out and see if they're under the potion or not. Or do it through journals, if I can't find them in person."