In 2011, Finguerut was appointed Secretary of the International Narcotics Control Board (INCB) by Secretary-General of the United Nations Ban Ki-moon, in replacement of Jonathan Lucas.

[9] Fingerut was INCB secretary during the chairmanship of Hamid Ghodse,[10] at times of prime relevance for the institution, characterized by an increased diplomatic presence.

[16] As CND Secretary, Finguerut was criticized by some civil society groups, including Human Rights Watch, for banning non-governmental organizations from access to the main negotiating forum of the commission.

[17] During Finguerut's term as INCB Secretary, he maintained conflictual relations with some countries, particularly in the case of Bolivia after its withdrawal from the Single Convention on Narcotic Drugs in 2011 and subsequent reservation on coca leaf the next year.

His nomination as head of the health section of UNODC at the peak of the COVID-19 pandemic[20] was criticized for his lack of qualifications in health-related sciences.