The whistleblower said: "After the construction workers found that thin steel was used in Building 9 of Huidong construction site, they took samples at the scene and handed them over to a regular and qualified testing company for testing. According to the inspection report issued by the inspection company, the weight deviation of steel bars sampled at Huidong site is unqualified (the national regulations stipulate that the weight deviation of steel bars shall not exceed plus or minus 4 of the national standard, and the inspection of steel bars at Huidong site is negative 19, which is much lower than the national standard). After consulting experts, I learned that one of the important criteria for judging whether it is slimming steel is that the weight deviation is lower than the national standard. The steel bars in Huidong construction site are much lower than the national standard, and they must be slimming steel. "