Farley conducted a study that showed that 82 percent of a sampling of prostitutes had been physically assaulted. Murder accounts for approximately half the deaths of prostitute women, according to a 2004 study published in the Journal of Epidemiology.
The so-called "oldest profession in the world" is also one of the most dangerous.
The four victims in the Atlantic City slayings were discovered just miles beyond the bright lights of the casinos, hotels and tourist attractions in a dark underbelly of drugs, crime, poverty and prostitution.
"It's a little city with big-city problems," Maj. Kathleen Calvo of the local Salvation Army told ABC News.
On the edge of affluent Egg Harbor Township and bordering Atlantic City, Black Horse Pike shares these big-city problems.
A largely forsaken strip, it is home to derelicts, out-of-luck gamblers, drug dealers, prostitutes, the working poor, and in some cases, according to Bill Southery, president of the Atlantic City Rescue Mission, those with social and mental problems who were relocated there and have no other place to go.