The buyer can understand the mechanism or the item and use caution when buying products or products that are sold in the market is difficult, as well as after the corruption of drug yiao violates, which is consistent with the no สภาะ WA social complexity in production. If the damage caused by the products manufactured for sale in the market who have been corrupted, they have the burden to prove that the damage was caused by, and any person who willfully or anchovies patch causing damage, which means that it must be traced to a fault in the manufacturing process, in accordance with the theory of abuse themselves.