Trafficker Linked to Purest Fentanyl in San Diego Sentenced to Prison

Aaron 'El Kobi' Kobisher received over 8 years for his role in a drug trafficking ring spanning the U.S. and Mexico.

Published on Feb. 14, 2026

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Aaron Leib Kobisher, a dual U.S.-Mexican citizen, was sentenced to over 8 years in prison for his involvement in a drug trafficking ring that brought methamphetamine, fentanyl, and cocaine from Tijuana to cities across the United States. Kobisher, who had previously survived multiple assassination attempts in Tijuana, pleaded guilty in 2024 to conspiracy charges related to the drug distribution scheme.

Why it matters

This case highlights the ongoing battle against the opioid crisis, as well as the transnational nature of drug trafficking networks that operate across the U.S.-Mexico border. Kobisher's sentencing comes as authorities continue to grapple with the influx of highly potent fentanyl, which has contributed to a surge in overdose deaths nationwide.

The details

Kobisher admitted that from 2021 to 2023, he was involved in a drug trafficking group that brought drugs across the border from Tijuana to cities like San Diego, Atlanta, and New York. In one 2021 seizure, authorities discovered over 4 pounds of the purest fentanyl they had ever tested. Kobisher often crossed the border between Tijuana and San Diego, but stopped after drug seizures linked to him in 2022, leading prosecutors to believe he had fled to Mexico.

  • Kobisher's criminal conduct dated back to at least 2021.
  • He was arrested in Madrid in June 2023 and extradited to the U.S.
  • Kobisher pleaded guilty in 2024 and was sentenced on February 13, 2026.

The players

Aaron Leib Kobisher

A 36-year-old dual U.S.-Mexican citizen who pleaded guilty to conspiracy charges related to a drug trafficking ring operating between San Diego and Tijuana.

Guadalupe Valencia

Kobisher's defense attorney, who said his client was remorseful and that his arrest likely saved his life.

Kevin Mokhtari

The Assistant U.S. Attorney who prosecuted the case against Kobisher.

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What they’re saying

“My client is really remorseful. He has clearly learned from this whole experience.”

— Guadalupe Valencia, Defense Attorney

“It's almost like he was living a double life.”

— Guadalupe Valencia, Defense Attorney

What’s next

The judge will decide on Tuesday whether to allow Kobisher to be released on bail pending his sentencing.

The takeaway

This case highlights the ongoing challenge of combating the opioid crisis and the transnational nature of drug trafficking networks that operate across the U.S.-Mexico border, as authorities continue to seize record amounts of highly potent fentanyl.