Colleges report an average of about 10 to 20 murders a year on U.S. campuses, according to Carter. An estimated 40 to 50 murders happen among students living in off-campus housing, he said.
Overseas, each college runs its program differently, according to Carter, and many students live on their own at universities not affiliated with their U.S. colleges.
"They are all over the map," said Carter. "It's difficult to get a handle."
Some, like Caroline Scott, a University of Colorado senior from San Francisco, break away from their organized programs.
Scott, 22, spent four months in Jaipur, India, in 2005. Though she does not blame her college or the program — School for International Training — she had a harrowing experience while completing her independent project.
She took a 24-hour trek by bus and train to work at an orphanage for refugee children in the Himalayas. When Scott reached her destination, a case of E. coli she had contracted in India had gotten worse and wasn't responding to antibiotics.
"I got sicker and weaker and lost 20 pounds," said Scott, who called her mother on her cell phone. "She freaked out and told me to go back to Jaipur and go to the hospital."
She boarded a bus back filled with only men. One sat down beside her, pulled down his pants and masturbated. No one on the bus offered help. After seven hours, shaken and afraid, she couldn't find a taxi to take her home.
She was sold a fake bus ticket and was nearly stranded, but eventually made it back to Jaipur.
"I arrived at 3 a.m. and it was completely abandoned," she said. "No one goes outside at night, especially women. I finally found a sleeping rickshaw driver and we managed to find my friend's guest house."
Still, Scott loved India and didn't fault her program. "They did a pretty good job telling you where to go when you were in trouble," she said.
Scott was required to check in once a week, write out her itinerary and contact phone numbers and provide an adviser in the city where she was doing independent study.
"They kept good track of us," said Scott, now back in the United States.
Most students are safe in programs abroad, according to Brian Whalen, president and CEO of The Forum on Education Abroad at Dickinson University, who sent his own daughter to Greece.
The death of the British student was "very unusual," he said.
"That could occur anywhere on a campus in the U.S. We in the field know about it and are improving our programs. In this case it was an aberration."
Often, it is American students behaving badly that college officials have to deal with.
The New York Times recently reported that Americans students in Amsterdam used their dorm room windows to dispose of their trash, raining it down on passers-by. Others in Spain got into a knife-and-stick fight with locals.
"Colleges work hard to impress on their students that they are good ambassadors for their college and the U.S.," said Whalen, whose organization issues guidelines on safety and behavior overseas.
Most students who choose these programs are high academic performers and highly motivated, he said.
"But sometimes students see the glossy photos and sometimes sugar coat what the study abroad experience can be," said Whalen. "It's challenging every moment in a different culture, but in the end, they are better students and individuals because of it."
Lynn, who now lives in Denver and works as an overseas tour consultant for high school teachers, agreed.
"Going abroad in the first place is a risk," she said "You never know what you are going to find, especially when you go past your comfort zone. But that is when you start to gain something."
"There's a fine line between trusting your instincts and putting yourself out there," said Lynn. "Be smart and responsible. But a lot of flukey things can happen in America, too."