In September 2016, Bermúdez Zacarías presided over the tax fraud investigation of Naim Libien Kaui, the owner of Mexico City's newspaper "Unomásuno". "Unomásuno" and the owner's son, Naim Libien Tella, were linked to González Valencia's drug trafficking group the previous year. According to court documents, Libien Kaui committed an income tax fraud of MXN$11,413,886 in 2012, as well as other income tax frauds in 2010, 2011, and 2013. The day Libien Kaui was arrested, he issued a writ of amparo to the State of Mexico appeals court over which Bermúdez Zacarías presided. Bermúdez Zacarías, however, struck down the writ of amparo under the rationale that the case was out of his jurisdiction. He then pushed the case to another court in Mexico City. In October 2016, he dismissed a writ of amparo issued by Gildardo López Astudillo (alias "El Gil"), a major suspect in the mass disappearance of 43 students in Guerrero that occurred in 2014. The writ of amparo was issued because El Gil wanted to be transferred from Altiplano prison. However, he rejected the request because complaints for approvals were nonexistent. Bermúdez Zacarías also presided over the cases against Javier Torres Félix, convicted high-ranking leader of the Sinaloa Cartel, and Mario Cárdenas Guillén, a suspected Gulf Cartel leader.