Regulations on Food Safety and Sanitation Violation Report and Reward Article 8

When a violation report is jointly made with two or more people, all informants receive the reward. When two or more people file individual reports for the same violation, the informant who files first receives the reward. When it is impossible to identify the chronological order of the reports, the reward is to be equally distributed to all informants.
中文原文 食品安全衛生檢舉案件處理及獎勵辦法第8條
二人以上聯名檢舉之案件,其獎金由全體檢舉人具領;二人以上分別檢舉案件而有相同部分者,其獎金發給最先檢舉者;無法分別先後時,平均發給之。

English translation for reference only; the Chinese text prevails. Not legal advice.