One accident after another, it certainly couldn't be a coincidence. However, the criminal was too well-hidden; they had been investigating for so long without a shred of a clue. Every suspect they caught insisted it was an accident, and with no casualties involved, plus their seemingly sincere admittance of guilt, the police had no substantial evidence and couldn't just arrest people without good reason. They would give the suspects a verbal warning, at most detaining them for a couple of days and imposing a fine before releasing them.
It can be said that they were indeed ineffective in their work.
But Jiang Yuan was not intent on dwelling on their negligence; after all, the police are not omnipotent. Her initial objective wasn't for the police to identify the murderer.
After all, if it was that easy to find out, then the car accident that killed her parents would not have been dismissed as just an accident.
