The opinion presents the evolving interpretation of the "reasonable suspicion" of money laundering, which triggers the duty of financial intermediaries to report immediately to the Money Laundering Reporting Office (MROS; Swiss FIU). A series of legal and political decisions by the Swiss authorities have had a significant impact on the significant workload overload faced by the MROS, which has been chronic and aggravating in the last 10 years, due to its limited resources.