The Pharr-Reynosa International Bridge fired Esmeralda Arevalo back in December 2011.
Arevalo believes she was let go for what she reported to police.
"They're stealing the profit out of the Pharr bridge,” said Arevalo.
Arevalo worked collecting toll money from those headed into Mexico.
She said bridge supervisors demanded she sell them Mexican Pesos and not report it.
"It's wrong,” said Arevalo. “I mean I see it wrong."
What's wrong according to Arevalo is that bridge supervisors would take those pesos to a Casa de Cambio or money exchange and pocket a profit they made from the exchange rate.
Here is how Arevalo said it would work: at the Pharr bridge the exchange rate is fixed at 16 pesos to $1.00.
Everywhere else the exchange rate changes based on the market.
For example, currently someone could take 16 pesos to a money exchange and get $1.24.
Compare that to the rate at the bridge, and it's a 24-cent profit.
The average person cannot exchange money at the Pharr bridge, but Bridge Director Jesse Medina said he allowed his employees to do it at the 16 pesos to $1.00 rate.
"The employees had asked for, including (Arevalo), had asked for exchanges of money for emergencies, mostly for dental stuff,” said Medina by phone. “They were infrequent and far and in between, and when they did occur, we allowed it."
Medina told Action 4 News he never allowed money exchanges to exceed $100.00.
"I suppose that if it was done in large quantities of money by one person, you could make that case,” said Medina. “That was not the case here."
Arevalo's wrongful termination lawsuit targets Medina and Pharr City Manager Fred Sandoval.
Medina called Arevalo a disgruntled employee.
He said he fired her for bad conduct and making a false workers’ compensation complaint.
"It's just smoking mirrors on the part of the employee, and I'd love for it to go to a jury," said Medina.
Both Arevalo and Medina welcome a jury's decision as to who really is dealing dirty.
In addition to embezzlement, Arevalo's lawsuit also includes allegations of sexual harassment and mistreatment from bridge workers.
Pharr City Manager Fred Sandoval said Thursday morning he needed to talk to his lawyer before giving any comment on this case.
Since then, he did not return calls from Action 4 News.
Bridge Director Medina, who was once Pharr's Police Chief, said Pharr Police have already investigated this case and found no wrongdoing.
Pharr Police did confirm the case is closed.
Meanwhile, Medina said the bridge has changed its policies.
He said employees are no longer allowed to exchange money for personal use.
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