"There are lots of ways we can make them admit to their deeds. All you need to do is serve them something I'll brew for you. You can add it to their drinks or serve it sweetened with honey."

Tomoko reached for her cup of tea to take a sip while JK digested that option. "If they develop indigestion because of drinking the brew, then you know you've caught them. If they lose the ability to speak for a day, then you'll know they're innocent. The consequences are mild, I think, and worth risking it."