We would like to release our laboratory report about the GC-MS analysis of the extract from (1) NonLethal Technologies CS Multi Smoke 5 Projectile (made in USA), (2) Norcino NF01 CS Smoke Projectile (made in China), and (3) Jing An Tear Gas Grenade (believed to be made in China) to investigate their chemical contents for comparison. In this report, we will let the public to know our testing procedure, results, conclusion, hypothesis and the operation setting of GC-MS so that Hongkongers can understand our results and the suggestions provided by our chemists. Last but not least, we hope that the report can let any science teams which intend to analyze tear gas-related topics, get more data and find the truth together for the seek of public’s health & safety.