Suspected crime refers to the situation where it is difficult for the judiciary to prove whether the defendant committed a crime or the severity of the crime. The principle of never suspected crime is the embodiment of the idea of "favorable defendant" in modern criminal law, which is one of the specific contents of the presumption of innocence. If the defendant is guilty and the defendant is not guilty, the defendant is presumed innocent. Based on the above definition, which of the following uses the principle of suspicion? ["Zhao Liu was sued for stealing someone else's online password, but the court acquitted him because Zhao Liu was proven to never use the Internet.", 'Shimou and Tangmou fought and both were injured. Because it was impossible to determine who would start first, the court proposed a settlement out of court.', 'Qian was sued for suspected drug poisoning, but the court ruled that Qian was not guilty because of insufficient evidence.', 'Zhang San sued Li Si for infringement, but failed to produce any evidence and lost the case.']