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Likieell Ressler chal 7 CRIME SCENE ANALYSIS ‘The major statistical analysis procedure employed for the variables was the two independent sample test (D'Agostino, 1971, 1972; Laun- ney, 1970). For these variables, the F test for cquality of variance was employed to aid in selecting the appropriate standard error for the denominator of the t test and the appropriate degrees of freedom. Variables significant at the .05 level of significance by the t test were identified. The full description of statistical tests employed is reported elsewhere (D'Agostino, 1985). The major findings of differ- ences between crime scene variables and profile variables for organized and disorganized offenders are reported as follows. (See Table 1.) Crime Scene Differences Between Organized and Disorganized Murderers We firstestablished that based on data available at the crime scene, there are significant differences between the organized and disorga- nized offender. However, there are no situations where the organized and disorganized offenders are mutually exclusive. Thatis, both types of murderers are capable of all types of behavior, For example, an organized murderer might not use a vehicle ora disorganized mur- derer might use restraints. Summary results are listed below. (Sec Table 2.) Organized offenders are more apt to @ plan, ® use restraints, ® commit sexual acts with live victims, © show or display control of victim (i.e., manipulative, threatening, want victim to show fear), and @ use a vehicle. Disorganized offenders are more apt to ® leave weapon at the scene, ® position dead body, @ perform sexual acts on dead body, @ keep dead body, ® try to depersonalize the body, and ® not use a vehicle. In meeting the study’s first objective, we demonstrated that there are in fact consistencies and patterns in crime scenes that are objec- tively quantifiable and that distinguish organized from disorganized 66