Chapter 16 - Rapist Modus Operandi and Signature

Abstract

This chapter discusses various aspects of rapist modus operandi (MO) and signature. A sex offender's MO behavior is functional in nature and is composed of learned behaviors that can evolve and develop over time. General types of MO behaviors can include crime scene characteristics such as number of offenders, route taken to offense location, and nature and extent of precautionary acts. It is suggested that while signature behaviors refer to specific acts committed by an offender, overall offender signature refers to the pattern or cluster of MO behaviors, signature behaviors, and motivations found within an offense. Personal items taken from the victim or the crime scene may have sentimental value to the offender. The means of locating and gaining access to the victim's personal items are generally MO behavior and they indicate the offender's criminal skills, confidence, and level of planning. It is suggested that when looking at offender MO and signature behaviors, it is important for investigators to examine the victim or target selection, as well as offender departure strategies.