How I Solve Cases with Gossip at the Police Station

With dark circles under his eyes, Lin Fan sat in the interrogation room, looking utterly hopeless. “Mr. Lin, please explain again how you knew the killer had parked the car at the abandoned factory, and that the murder weapon was hidden beneath the third trash can.” Lin Fan's gaze drifted toward the window, where a crow was croaking in a grating voice: “Sunflower seeds! The guy was eating sunflower seeds! He spat the shells all over the ground!” He turned back and said earnestly to the officer, “If I told you a ‘friend’ of mine saw it, would you believe me?” The officer: “...Is your friend a detective?” Lin Fan: “Uh, more or less. He's a... ‘street worker’ who's... exceptionally well-informed.” (Just then, the crow outside cawed, “Idiot! Idiot!”)