range. In 1993, Canter and Larkin developed two models of offender behaviour: marauder and commuter models. The distinction is that marauders operate in an area that is in close proximity of the offender's home base while commuters commit crimes far outside of the habitual zone. It hopes to differentiate the two types of serial offenders by studying the relationship of the criminal spatial behaviour to the offender's place of residence. Considerations In developing a geographic profile, there are important factors to consider: Crime locations A crime will contain evidence. The evidence found at the location provides information leading to the offender and victim's prior location, clues as to where they may have gone, as well as information depicting what happened. Collecting and comparing clues from numerous crime locations influences the development of the offender's patterns. Offender type According to Dr. Kim Rossmo there are four different types of offenders with regard to geographic profiling. Hunter: the hunter singles out a specific victim without leaving his home territory. He will commit crimes where he lives. Poacher: a poacher will travel out of his home territory to do his hunting. Troller: A troller will realize an opportunistic encounter while occupied in other activities and then strike. Trapper: a trapper will draw the victim into him using different seemingly harmless situations. Hunting Methods Hunting process can be broken down into two parts. (1) The search for a suitable victim, and (2) the method of attack. Target backcloth (the spatial opportunity structure of crime sites) “Target or victim backcloth is important for an understanding of the geometric arrangement of crime sites; it is the equivalent of the spatial opportunity structure (Brantingham & Brantingham, 1993b). It is configured by both geographic and temporal distribution of “suitable” (as seen from the offenders perspective) crime targets or victims across the physical landscape. The availability of particular targets may vary significantly according to neighborhood, area, or even city, and is influenced by time, day of week, and season; hence, the term structural backcloth is also used.” Arterial roads and highways Large roads and highways play a huge part in crime strictly because it how both criminals and victims are forced to travel. Crimes will often cluster around freeway exits and entrances. Bus stops and train stations These are two forms of rapid transportation that may also be used by offenders and victims and can be hot spots in