Carjacking is a robbery in which a motor vehicle is taken over. In contrast to car theft, carjacking is usually in the presence and knowledge of the victim. A common crime in many places in the world, carjacking has been the subject of legislative responses, criminology studies, and prevention efforts. Commercial vehicles such as trucks and armored cars containing valuable cargo are common targets of carjacking attempts. Carjacking usually involves physical violence to the victim, or using the victim as a hostage. In rare cases, carjacking may also involve sexual assault. The word is a portmanteau of car and hijacking. The term was coined by reporter Scott Bowles and editor EJ Mitchell with The Detroit News in 1991. The News first used the term in a report on the murder of Ruth Wahl, a 22-year-old Detroit drugstore cashier who was killed when she would not surrender her Suzuki Sidekick, and in an investigative report examining the rash of what Detroit Police call "robbery armed unlawful driving away an automobile" (in dispatch slang shortened to R.A.-YOU-Da) plaguing Detroit. TV series CHiPs season 2 episode 20 airing 2/24/79 has the character Ponch, played by Erik Estrada, using the term carjacking.> A study published in the British Journal of Criminology in 2003 found that "for all of the media attention it has received in the United States, Europe and elsewhere, carjacking remains an under-researched and poorly understood crime." The authors conducted semi-structured interviews with 28 active carjackers in St. Louis, Missouri, and based on these interviews concluded that "the decision to commit a carjacking stems most directly from a situated interaction between particular sorts of perceived opportunities and particular sorts of perceived needs and desires, this decision is activated, mediated, and shaped by participation in urban street culture." A study published in the Journal of Contemporary Ethnography in 2013 noted that "carjacking requires offenders to neutralize victims who are inherently mobile and who can use their vehicles as both weapons and shields.