Hearing Jiang Xia's words, the officers briefly fell into confusion, just like they had not long ago at Jodie's place, their eyes seeming to spiral into mosquito coils.
Inspector Megure: "..." Had the Riddler virus Brother Jiang Xia had caught from that dark-skinned brat still not been fully purged? Damn Osakans...
Under his complicated stare, the new Riddler across from him was still continuing unhurriedly, "Aren't there often things in a restroom that get thrown away once they're used up?"
"Things you throw away after using..." Inspector Megure scratched his hat, briefly feeling as if he were back in high school being questioned by a teacher. He racked his brains. "Air freshener? Disposable towels?"
Officer Takagi also guessed, "Hand soap? Toilet paper?... Oh, right, and the cardboard core of the toilet paper!"
As they spoke, a small figure sneakily opened the restroom door and crept out quietly.
Jiang Xia glanced at Haibara Ai and noticed a barely perceptible excitement beneath her calm expression. Then he saw that her cuff was damp, and knew the case could be wrapped up.
He nodded and looked back at the two officers. "The culprit found a used-up cardboard core, smeared poison on it, and hung it on the toilet paper holder.
"That way, after the president finished using the restroom and reached out for toilet paper, he would grab that poisoned paper core.
"Finding the toilet paper had run out, he reached out with his right hand, removed the poisoned paper core, casually stood it on the floor nearby, then took a new roll from the holder and mounted it onto the toilet paper holder.
"After that action, the surface of the new roll was contaminated with poison. But very soon, that poisoned outer layer would be torn off and used, then flushed away