in the search of the missing persons, securing expert opinions from various forensic science areas, which have not yielded any results. 30. The State underscored that, among the elements of documentary evidence, there are reports from the Prosecution Services and the Offices of the Attorney General and District Attorneys for more than half of all federal bodies, on the basis of which it has been confirmed that no results have been obtained in the search for Nitza Paola Alvarado Espinoza, José Ángel Alvarado Herrera, and Rocío Irene Alvarado Reyes in their records of unidentified persons or on their lists for the identification of missing persons. In addition to the above, the State reported that it secured 31 pieces of evidence from experts and conducted 10 inspections aimed at locating the possible remains of said persons. 31. It indicated that, in the months of August to October 2014, statements were taken from various troops of the Mexican Army and ballistic tests were conducted, on the basis of which it was possible to identify the probable brands of firearms used in the cave areas located in the Ejido Benito Juárez in the Municipality of Buenaventura in the State of Chihuahua. It indicated that, within this lapse of time, 16 pieces of documentary evidence were obtained and a series of short-term steps were scheduled to look for and locate the victims. 32. The State argued that, as part of the preliminary inquiry in the PGR's Unit for the Search of Missing Persons and as a result of the steps and investigations conducted, on March 31, 2014, the PGR filed with a Federal Judge a request for the above-mentioned preliminary inquiry against one person of the military probably responsible for the disappearance of Nitza Paola Alvarado Espinoza, José Ángel Alvarado Herrera, and Rocío Irene Alvarado Reyes. It pointed out that, although the federal judge with which the request was filed refused to issue the warrant of arrest against this person of the military, the PGR filed an appeal against this ruling, which was declared inadmissible by the Fourth Unitary Court, upholding the refusal to issue the warrant of arrest against the above-mentioned person. 33. In that regard, the State reported that, because in this procedural stage of the proceedings it was not possible to challenge the ruling by filing an appeal on constitutional grounds (amparo) because that could only be done by the victim, on August 21, 2014, the PGR notified the legal representative of the next of kin of the ruling of the Fourth Unitary Court. It specified that at present the appeal on constitutional grounds (amparo) is an effective remedy that is available for the victims under domestic law. 34. The State also reported that on October 12, 2015 it called the Operational Supervisor of the Federal Investigation Agency in Ciudad Juarez at the time of the facts of the case, to testify, who said he does not know the alleged victims because at the time of the events occurred he was on medical leave . 35. With regard to the search of the missing persons, the State reported that it has taken a series of steps for the purpose of finding the victims, involving the use of state-of-the-art techniques in the matter. It indicated that the PGR has coordinated actions with the institutions administering justice in all federal entities to compare genetic profiles of their databases, and that it has also hired the services of the Argentine Team of Forensic Anthropology and international experts who were part of the Project of Assistance for the General Prosecution Service of the State of Chihuahua. 36. Regarding this, the State argued that, in the framework of the investigation conducted by FEVIMTRA, on August 9, 2011, a search party was organized in a mineshaft in the Municipality of Buenaventura in the State of Chihuahua, where it was possible to recover human remains which were transferred, for analysis, to the City of Chihuahua. It pointed out, however, that the results concluded that none of the rests pertained to the three missing persons, and this was duly reported to their next of kin. 37. It also indicated that it conducted six additional search parties: the first in a plot of land located in the Ejido Benito Juárez in the Municipality of Buenaventura in the State of Chihuahua, where there are three mines; the second in an area known as "Las Emes," located along a stretch of highway between Buenaventura and Zaragoza in the State of Chihuahua; the third search was conducted in “Janos”, the fourth and fifth search were conducted in the premises called “Los Zorritos” and “Las Albercas el Capricho”and the