The context of the following conversation is Robin was concerned their Kai was smoking drugs so when Kai left for school Robin entered Kai's room to search for evidence.:
Kai says My mom thought I was doing drugs so she snuck into my room while I was at school..
The friend responds Are you sure she did that?.
Kai responds Yeah, I could tell someone had been in my room.  I actually keep it pretty neat and stuff had been moved around..
The friend responds Did she find anything?.
Kai responds No way! Do you think I'm stupid enough to leave anything I don't want her to find in my room?.
The friend responds I guess not. Hopefully she'll get off your back since she didn't find anything..