A pitiful drug addict (2)

"Do you know how Miss Leah could get her hands on the chalk? And where did you guys usually hide to use this thing together?"

The guy was stunned over that question, which I understood well. Because that kind of question would leak some secret out of his mouth. 

"Why do you need this information? You're not an undercover cop, aren't you?" He asked suspiciously. I didn't expect him to still have some logic in his brain after so much torment, especially in front of the crystal meth he had wanted for so long.

I chuckled when prompted with that question, "Do you think there is a fifteen years old undercover cop like me? That's ridiculous, you know."

"Then why do you want to know?" He asked. 

"Because…"

I began to brainstorm again, trying to find a good reason so he wouldn't get suspicious. After racking up my brain to its limit, I still couldn't find a good reason for this.