Zheng Tan hadn't jumped to the conclusion that the needleless syringe was related to the trap set for Qin Tao just because of this discovery. He looked further at the arguments among the experts, where some of the opposition had produced various negative pieces of evidence.
The needleless syringe works by injecting with pressure and doesn't have the long, slender needle like a regular syringe. However, not all who are injected feel nothing. The sensation of the injection varies from person to person; some feel nothing, while others have described it as feeling like a flick from a hand. The effect of the injection also varies: thirty percent of people show no trace after the injection, fifty percent have red spots on their skin, and twenty percent experience a bleeding phenomenon.
