She is smiling these days, though, beaming with pride to be wearing a police badge again. And the sign on the door to her office reads: "Chief."
Nearly a decade after psychiatric reports said Pasantino suffered from an "irreconcilable" illness that made her unfit to serve, she was welcomed back to the police force this week and appointed deputy police commissioner in the judicial communications department.
"This is a milestone," Pasantino, 49, told The Associated Press on Thursday. "I'm the first transgender police chief in Latin America. It's an unprecedented and important step to show Latin America and the world that we are an open institution."
"The world has changed," Pasantino said. "You can live a life of gender identity and it's no longer necessary to live a double life."
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Pasantino struggled with this duality long before the passing of the gender identity law. She joined the police force as a man in 1988 and became a decorated officer, a respected police spokesman and then the leader of an anti- narcotics team. But at home, she lived as a woman.
When Pasantino began dressing in skirts and high heels, the couple went out at night through the garage door to avoid being spotted by the neighbors. They would drive around Buenos Aires, but Pasantino at first lacked the courage to get out of the car.
"The decisive moment came when my wife finally told me: 'Either you step out or you'll never leave the house looking like this again. I've put up with you for three hours getting ready and putting on makeup.'"
Pasantino and Mauro were high school sweethearts and have been a couple for 31 years.
Pasantino, who has shoulder-length blonde hair, still wears the same engagement ring that she first wore as a man long ago.
"She has backed me with everything," Pasantino said about Mauro, who is also a lawyer. "She has been my pillar of support."
Pasantino said she was forced to take a leave of absence from the police department after coming out as a transgender woman in 2008. Every three months, she would present a psychiatric evaluation hoping to rejoin the force, but a committee reviewing her case repeatedly extended her leave.
Then the leadership of the federal police changed and she won reinstatement, Pasantino said.