INTERNACIONAL
Los perros y los gatos pueden ser portadores secretos de ADN en las escenas del crimen
Perros y gatos pueden transportar ADN humano entre personas, objetos y ambientes, incluso a lugares donde quienes viven con ellos no estuvieron.
Científicos de Australia descubrieron que en escenas de crímenes, el material genético hallado en el pelaje o en superficies asociadas a los animales no siempre corresponde a quienes forman parte del hogar.
Ese material que se toma como parte de las investigaciones forenses puede incluir rastros de visitantes, personas que han transportado al animal o usuarios de los vehículos involucrados.
Este hallazgo, que fue publicado en la revista Forensic Science International, puede cambiar la manera en que la ciencia forense interpreta la evidencia en delitos donde hay perros o gatos.
El equipo comprobó que “los perros pueden servir como vectores efectivos para la transferencia de ADN humano”, incluso con contactos breves.
En el estudio participaron Heidi Monkman y Mariya Goray, de la Facultad de Ciencia e Ingeniería de la Universidad Flinders.
También colaboraron Roland van Oorschot, de la Oficina del Jefe Científico Forense en el Departamento de Servicios Forenses de la Policía de Victoria y de la Facultad de Agricultura, Biomedicina y Medio Ambiente de la Universidad La Trobe, y Volgin Luke, de Ciencia Forense de Australia Meridional.
La investigación buscó saber si los animales domésticos, presentes en muchas escenas de crímenes, pueden influir en el análisis de ADN.
Aunque ya se sabía que el material genético puede transferirse entre personas y objetos, el rol de perros y gatos como intermediarios había sido poco explorado.
El equipo observó que, a diferencia de objetos o prendas, los animales pueden almacenar y transferir ADN humano de quienes viven en el hogar, de personas visitantes y de quienes los manipulan para un traslado.
Esto es clave en delitos como el robo de animales de compañía, donde el ADN puede ayudar a reconstruir los hechos.
El objetivo fue determinar si un animal puede recibir, retener y trasladar ADN humano a personas y lugares diferentes. Para comprobarlo, diseñaron un experimento controlado.
Un cuidador, sin contacto previo con los animales ni con quienes viven en los hogares, trasladó a cinco perros de distintas razas entre viviendas y autos desconocidos para todos. Así, cualquier ADN hallado debía provenir de esa interacción puntual.
El análisis se centró en el cuerpo del perro, la ropa del cuidador y el interior de los autos. Los perros, la camisa del cuidador y el asiento trasero del auto fueron las superficies clave que se analizaron, detallaron.
Se seleccionaron cinco perros y un cuidador experimentado, sin vínculo previo con los animales ni con las familias. El cuidador tampoco había usado antes los autos, salvo uno propio.
Luego del traslado, los investigadores tomaron muestras de ADN en la cabeza, lomo y costados de cada perro, una hora después del contacto.
También recolectaron rastros en el asiento trasero de cada auto y en distintas partes de la camisa del cuidador.
El ADN de al menos una persona que vivía en el hogar se detectó en el 85 % de las muestras tomadas de los perros.
En los autos, la presencia de ese ADN alcanzó el 35 %, y en la ropa del cuidador, el 10 %. El ADN del cuidador apareció en el 85 % de sus propias camisas, en el 40 % de los perros y en el 13 % de los autos.
Se halló ADN de los propietarios de los autos en los perros, en la ropa del cuidador y en el interior del vehículo, aunque nunca hubo contacto directo entre ellos.
Así, la investigación demostró que los contactos breves pueden permitir la transferencia y posterior recuperación de ADN, incluso a través de intermediarios.
En el 75 % de las muestras hubo al menos un contribuyente desconocido, lo que muestra lo complejo que resulta rastrear el origen del ADN en la vida cotidiana.
El equipo recurrió a herramientas estadísticas para discriminar perfiles principales y minoritarios, y remarcó que la mayoría de estas transferencias indirectas se presentaron como componentes menores o minoritarios en la mezcla.
La cantidad de ADN recuperado varió según la zona del contacto y el tiempo. La cabeza y el lomo de los perros mostraron mayores cantidades.
El equipo reconoció que el tamaño de muestra fue reducido, lo que limita la posibilidad de generalizar estos resultados.
Consideran que su trabajo es solo un primer paso y sugieren ampliar el estudio con más animales, diferentes escenarios y otros tipos de contacto.
La conclusión central es que “los perros pueden actuar como vectores de transferencia de ADN cuando son trasladados entre dos lugares”, incluso si ese desplazamiento dura poco tiempo.
Recomiendan que, en casos con animales domésticos, se tomen muestras en la ropa, en los propios animales y en los vehículos involucrados.
La investigación subraya que la facilidad con la que el ADN viaja en contactos breves y su persistencia en distintas superficies obliga a repensar las estrategias de la ciencia forense en delitos con animales.
El estudio deja claro que perros y gatos no son solo testigos mudos en las escenas del crimen: pueden convertirse en piezas clave para resolver un caso o, al mismo tiempo, en el mayor enigma para quienes buscan la verdad.
En diálogo con Infobae, el doctor en ciencias naturales Guillermo Giovambattista, investigador en genética no humana del Instituto de Genética Veterinaria Ingeniero Fernando Dulout, dependiente del Conicet y de la Universidad Nacional de La Plata, en Argentina, explicó tras leer el estudio: “Cuando una persona toca un objeto, deja su ADN a través de la piel. Por eso, se han podido identificar perfiles genéticos al recuperar el ADN de superficies. Por lo cual, es lógico que si una persona acaricia a un perro o un gato, se podría recuperar su ADN con la técnica apropiada”.
Además, el experto recordó que “hubo casos judiciales en los que el ADN de un animal doméstico permitió vincular al sospechoso con el lugar del hecho”.
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INTERNACIONAL
Grand jury rejects DOJ effort to indict Democratic lawmakers who urged military to defy illegal orders
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A grand jury in the nation’s capital on Tuesday refused the Justice Department’s attempt to indict a group of Democratic lawmakers who encouraged U.S. military members to ignore «illegal» orders in a video posted online.
The DOJ opened an investigation into the video featuring six Democratic lawmakers calling on troops and members of the intelligence community to defy illegal orders from the federal government. The lawmakers all served in the military or at intelligence agencies.
The lawmakers in the video were Sens. Elissa Slotkin of Michigan and Mark Kelly of Arizona, as well as Reps. Chris Deluzio and Chrissy Houlahan of Pennsylvania, Maggie Goodlander of New Hampshire and Jason Crow of Colorado.
«This administration is pitting our uniformed military and intelligence community professionals against American citizens,» the lawmakers said in the video. «Like us, you all swore an oath to protect and defend this Constitution. Right now, the threats coming to our Constitution aren’t just coming from abroad but from right here at home. Our laws are clear. You can refuse illegal orders. You must refuse illegal orders. No one has to carry out orders that violate the law or our Constitution.»
DEM SENATOR SAYS SHE’S UNDER FEDERAL INVESTIGATION OVER ‘UNLAWFUL ORDERS’ VIDEO
A grand jury in the nation’s capital on Tuesday refused the Justice Department’s attempt to indict a group of Democratic lawmakers who encouraged U.S. military members to ignore «illegal» orders. (Tom Williams/CQ-Roll Call, Inc via Getty Images)
Grand jurors declined to sign off on charges against the lawmakers, according to The Associated Press. It was not immediately clear whether prosecutors had pursued indictments against all six lawmakers or what charges they attempted to bring.
Prosecutors could still attempt to secure an indictmentto secure an indictment against the Democrats.
President Donald Trump had accused the lawmakers of being «traitors» who engaged in «sedition at the highest level» and «should be in jail.» He even suggested they should be executed over the video, although he later attempted to walk that comment back.
Slotkin, who previously worked at the CIA and Defense Department, was targeted with a bomb threat just days after the clip and Trump’s subsequent statements suggesting the Democrats be executed.
SEN MARK KELLY DIGS IN ON ‘ILLEGAL ORDERS’ STANCE, TELLS JIMMY KIMMEL HE’S ‘NOT BACKING DOWN’
President Donald Trump had accused the lawmakers of being «traitors» who engaged in «sedition at the highest level.» (Tom Williams/CQ-Roll Call, Inc via Getty Images; Andrew Harnik/Getty Images)
«Tonight we can score one for the Constitution, our freedom of speech, and the rule of law,» Slotkin said in a statement on Tuesday. «But today wasn’t just an embarrassing day for the Administration. It was another sad day for our country.»
Kelly, a former Navy pilot, called the attempt to bring charges an «outrageous abuse of power by Donald Trump and his lackeys.»
«Donald Trump wants every American to be too scared to speak out against him,» Kelly said on X. «The most patriotic thing any of us can do is not back down.»
In November, the Pentagon launched an investigation into Kelly, pointing to a federal law that allows retired service members to be recalled to active duty on orders of the secretary for possible court-martial or other punishment.
Pentagon chief Pete Hegseth has censured Kelly and is attempting to retroactively demote Kelly from his retired rank of captain over his participation in the video, which affirms that refusing unlawful orders is a standard part of military protocol.
Prosecutors could still attempt again to secure an indictment against the Democrats. (ANDREW CABALLERO-REYNOLDS/AFP via Getty Images)
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«As a retired Navy Captain who is still receiving a military pension, Captain Kelly knows he is still accountable to military justice,» Hegseth wrote in an X post on Jan. 5.
Kelly responded by suing Hegseth to block those proceedings, which he called an unconstitutional act of retribution.
During a hearing last week, a judge appeared to be skeptical of key arguments that a government attorney made in defense of Hegseth’s move last month to censure the Arizona senator.
The Associated Press contributed to this report.
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INTERNACIONAL
Caso Epstein: ahora el secretario de Comercio de EE.UU. admite que visitó la isla privada del financista pedófilo
Contactos en la isla privada
Funcionario clave del gobierno de Trump
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A top Iranian security official was spotted in Oman just days after Tehran and the U.S. held indirect nuclear talks in the Mideast sultanate.
Ali Larijani, a former Iranian parliament speaker who now serves as the secretary to the country’s Supreme National Security Council, was likely in the country to discuss what comes next after the initial round of talks, The Associated Press reported. The outlet noted that Larijani’s team shared photos of him with Omani Foreign Minister Badr al-Busaidi, the chief intermediary in the U.S.-Iran talks.
Iranian media reportedly said Larijani would deliver an important message, but later state television said al-Busaidi «handed over a letter» to the Iranian official without elaborating on the letter’s origins, according to the AP.
IRAN VOWS TO ‘TARGET US BASES’ IF AMERICAN FORCES LAUNCH AN ATTACK: REPORT
Secretary of the Supreme National Security Council Ali Larijani, right, listens to Omani Foreign Minister Badr al-Busaidi during their meeting in Muscat, Oman, Tuesday, Feb. 10, 2026. (Erfan Kouchari/Iran’s Supreme National Security Council Office via AP)
While in Oman, Larijani also met with Omani Sultan Haitham bin Tariq for nearly three hours, according to the AP, which cited the Iranian state-run IRNA news agency. Additionally, the outlet said that Larijani was set to travel to Qatar, which houses the U.S. military installation that bombed Iran’s nuclear sites in 2025.
Larijani accused Israel of playing a «destructive role» in the talks just before Israeli Prime Minister Benjamin Netanyahu’s expected visit to Washington, D.C.
«Netanyahu is now on his way to the United States. Americans must think wisely and not allow him, through posturing, to imply before his flight that ‘I want to go and teach Americans the framework of the nuclear negotiations.’ They must remain alert to the destructive role of the Zionists,» Larijani wrote on X.
Israel and Iran engaged in a 12-day war in the summer of 2025 which culminated in the U.S. bombing Tehran’s nuclear facilities. Iran, which has been grappling with mass anti-government protests, has blamed Israel and the U.S. for various grievances.
Omani Foreign Minister Sayyid Badr Hamad Al Busaidi meets with Iranian Foreign Minister Abbas Araghchi ahead of U.S.-Iran talks in Muscat, Oman, on Feb. 6, 2026. (Oman Foreign Ministry/Anadolu via Getty Images)
IRAN RAMPS UP REGIONAL THREATS AS TRUMP CONSIDERS TALKS, EYEWITNESS ACCOUNTS OF REGIME VIOLENCE EMERGE
Officials from both the U.S. and Iran have said that the first round of talks went well and suggested that they would continue.
«The Muscat meeting, which was not a long one, it was a half-day meeting. For us, it was a way to measure the seriousness of the other side, and to find out how we could continue the process. Therefore, we mostly addressed the generalities,» Iranian Foreign Ministry spokesman Esmail Baghaei said at a news conference Tuesday in Tehran, according to the AP.
«Our principles are clear. Our demand is to secure the interests of the Iranian nation based on international norms and the Non-Proliferation Treaty and peaceful use of nuclear energy,» Baghaei said, according to the AP. «So as for the details, we should wait for the next steps and see how this diplomatic process will continue.»
Omani Foreign Minister Sayyid Badr Hamad Al Busaidi, special envoy Steve Witkoff and negotiator Jared Kushner meet ahead of the U.S.-Iran talks, in Muscat on Feb. 6, 2026. (Oman Foreign Ministry/Anadolu via Getty Images)
SATELLITE IMAGES REVEAL ACTIVITY AT IRAN NUCLEAR SITES BOMBED BY US, ISRAEL
Iranian Foreign Minister Abbas Araghchi said indirect nuclear talks with the U.S. in Oman were «a good start» and that there was a «consensus» that the negotiations would continue.
«After a long period without dialogue, our viewpoints were conveyed, and our concerns were expressed. Our interests, the rights of the Iranian people, and all matters that needed to be stated were presented in a very positive atmosphere, and the other side’s views were also heard,» Araghchi said.
«It was a good start, but its continuation depends on consultations in our respective capitals and deciding on how to proceed,» he added.
President Donald Trump also expressed optimism about the indirect talks, telling reporters aboard Air Force One on Friday that «Iran looks like it wants to make a deal very badly. We’ll have to see what that deal is.»
When he was pressed on how long the U.S. would be willing to wait to make a deal with Iran, the president indicated some flexibility, saying he believes the two nations can reach an agreement.
«It can be reached. Well, we have to get in position. We have plenty of time. If you remember Venezuela, we waited around for a while, and we’re in no rush. We have very good [talks] with Iran,» Trump said.
President Donald Trump said indirect nuclear talks with Iran were «very good» and that Tehran «wants to make a deal very badly.» (Anna Moneymaker/Getty Images; Atta Kenare/AFP via Getty Images)
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«They know the consequences if they don’t make a deal. The consequences are very steep. So, we’ll see what happens. But they had a very good meeting with a very high representative of Iran,» the president added.
American and Iranian representatives held separate meetings with Omani officials on Friday amid flaring tensions between Washington and Tehran. Oman’s Foreign Ministry said the meetings were «focused on preparing the appropriate conditions for resuming diplomatic and technical negotiations.»
The Associated Press contributed to this report.
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