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Cartel violence has long scarred San Fernando, Mexico. The corpses of 72 Central American migrants were discovered at this ranch.Credit...Video by Daniel Berehulak

Armed with a handgun, a fake ID card and disguises, Miriam Rodríguez was a one-woman detective squad, defying a system where criminal impunity often prevails.

Published Dec. 13, 2020Updated June 25, 2023

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SAN FERNANDO, Mexico — Miriam Rodríguez clutched a pistol in her purse as she ran past the morning crowds on the bridge to Texas. She stopped every few minutes to catch her breath and study the photo of her next target: the florist.

She had been hunting him for a year, stalking him online, interrogating the criminals he worked with, even befriending unwitting relatives for tips on his whereabouts. Now she finally had one — a widow called to tell her that he was peddling flowers on the border.

Ever since 2014, she had been tracking the people responsible for the kidnapping and murder of her 20-year-old daughter, Karen. Half of them were already in prison, not because the authorities had cracked the case, but because she had pursued them on her own, with a meticulous abandon.

She cut her hair, dyed it and disguised herself as a pollster, a health worker and an election official to get their names and addresses. She invented excuses to meet their families, unsuspecting grandmothers and cousins who gave her details, however small. She wrote everything down and stuffed it into her black computer bag, building her investigation and tracking them down, one by one.

She knew their habits, friends, hometowns, childhoods. She knew the florist had sold flowers on the street before joining the Zeta cartel and getting involved in her daughter’s kidnapping. Now he was on the run and back to what he knew, selling roses to make ends meet.

Without showering, she threw a trench coat over her pajamas, a baseball cap over her fire engine-red hair and a gun in her purse, heading for the border to find the florist. On the bridge, she scoured the vendors for flower carts, but that day he was selling sunglasses instead. When she finally found him, she got too excited, and too close. He recognized her and ran.

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