...Nope. There's no way someone can know whether you're using it or not unless they're really paying attention to what they want to say versus what they actually say. I guess there could be a third person continuously trying to lie...? But that's getting kinda complicated.

Well, if that's how you want to handle it, though it sounds pretty risky. There are some very, very wary people at this place who either won't believe you or will wait to catch you.

Some people never realize. Some realize right away. ...There's one person who outright threatened my life for using it on him. His name is Loki, he's on Thistle, and he looks like... [insert description of Akechi]