And there are certainly places, like Ciudad Juarez or Tamaulipas state, I'd never visit now.
Neighbours gave police a description of Cardenas, who was arrested shortly afterwards in Ciudad Juarez.
Ciudad Juarez, on the Mexico-US border, is one of the world's most violent cities.
Peter's Square, a woman from Ciudad Juarez, Mexico, told CNN's Anderson Cooper she was thrilled.
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While working on a different project in Ciudad Juarez, I met with executives and politicians.
Olga Bashbush, spokeswoman for the U.S. consulate in Ciudad Juarez, declined to comment on Acosta's guilty plea.
"The situation in Ciudad Juarez is of special concern, " the State Department said in an alert last month.
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She will work with Ms Lopez Urbina on investigating the Ciudad Juarez killings.
"Armed robberies and carjackings, apparently unconnected to the narcotics-related violence, have increased in Tijuana and Ciudad Juarez, " it said.
"The situation in Ciudad Juarez is of special concern, " the alert said.
Ciudad Juarez, a drug war epicenter with a population of about one million, dealt with 3, 111 murders in 2010.
In Ciudad Juarez, more than 3, 000 people were killed in 2010 alone.
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More than 300 women were murdered in Ciudad Juarez in a wave of violence which started in 1993 and lasted for a decade.
Only a thin trickle of Rio Grande separates El Paso, Texas, from Ciudad Juarez, which in recent years has become a killing field.
The murder rate in Ciudad Juarez, which was widely seen as the world's murder capital in 2010, has been on a striking decline.
Ciudad Juarez is the most violent city in Mexico, with 3, 100 people killed in 2010 out of a population of more than a million.
In addition, all four bridges from Ciudad Juarez, Mexico, to El Paso were closed for a time Wednesday night due to a bomb threat.
Lawmakers and witnesses at the hearing universally applauded Calderon's efforts to deal with drug violence through actions such as sending troops into Ciudad Juarez.
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"The situation in Ciudad Juarez is of special concern, " it said.
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More than a third of the 2010 reported slayings of U.S. citizens occurred in the border cities of Ciudad Juarez and Tijuana, according to the State Department.
They carry out their work without the disturbance of the gruesome cartel violence that affects residents in more developed, industrial cities such as Ciudad Juarez and Monterrey.
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More than 250 women have been killed - a third of them also sexually assaulted - in Ciudad Juarez, close to the US border over the past decade.
At least 40 people have been killed in Ciudad Juarez since Friday, making it one of the most violent weekends in the city in years, Mexican officials say.
Ciudad Juarez, the Mexico border city known for its modern factories and strip malls and disturbing levels of cartel killings and street violence serves as an example throughout the book.
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Yakin Ertuk, a UN special rapporteur on violence against women, criticised what she called the impunity which prevailed around the murder of women, in Mexico, and in particular Ciudad Juarez.
In Ciudad Juarez, a city of 1 .3 million, multinational corporations and drug cartels are working to expand their operations, but during the day, the city hums with quiet efficiency.
The latest upsurge in violence in Ciudad Juarez saw 20 murders on Friday, 19 on Saturday and at least one on Sunday, a spokesman for the state attorney general's office said.
The group represents the families and friends of more than 300 women who were murdered in Ciudad Juarez in a wave of violence which started in 1993 and lasted for a decade.
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