1. February, 20011 Offenders: Serial Offending and Prior Bad Acts

2. February, 20012 Serial Rape by Undetected Rapists 63% had committed other rapes 483 total rapes/attempted rapes average of 4 rapes per rapist 63% had committed other rapes 483 total rapes/attempted rapes average of 4 rapes per rapist 1,882 men assessed: 120 rapists

3. February, 20013 Serial Offending by Undetected Rapists 14% other forms of sexual assault 17.5% sexual abuse of children 10.8% physical abuse of children 38.3% battery of adult partner 14% other forms of sexual assault 17.5% sexual abuse of children 10.8% physical abuse of children 38.3% battery of adult partner 58% of rapists were serial offenders

4. February, 20014 Serial Offending by Undetected Rapists 483 rapes and attempted rapes 17 other sexual assaults 319 acts of sexual abuse against children 95 acts of physical abuse against children 275 acts of battery against adult partners Total = 1,225 offenses 483 rapes and attempted rapes 17 other sexual assaults 319 acts of sexual abuse against children 95 acts of physical abuse against children 275 acts of battery against adult partners Total = 1,225 offenses

5. February, 20015 Non Rapists 1762 men Single-act Rapists Serial Rapists 44 rapes & attempted rapes 439 rapes & attempted rapes 44 men 76 men

6. February, 20016 Violence Committed by Serial Rapists The 76 Serial Rapists Committed: 439 rapes/attempted rapes 49 sexual assaults 214 acts of battery of partners 66 acts of physical abuse of children 277 acts of sexual abuse of children 1045 total acts of violence 439 rapes/attempted rapes 49 sexual assaults 214 acts of battery of partners 66 acts of physical abuse of children 277 acts of sexual abuse of children 1045 total acts of violence

7. February, 20017 Serial Rape by Incarcerated Rapists Abel et. al., 1987 126 rapists committed 907 rapes against 882 victims Weinrott & Saylor (1991) 37 rapists charged with 66 rapes later admitted to 433 rapes Abel et. al., 1987 126 rapists committed 907 rapes against 882 victims Weinrott & Saylor (1991) 37 rapists charged with 66 rapes later admitted to 433 rapes

8. February, 20018 Detecting Multiple Offending Chambers (1994): 36 adolescent sex offenders In treatment: revealed 111 victims Threatened with polygraph: 188 victims Under polygraph: 207 victims Chambers (1994): 36 adolescent sex offenders In treatment: revealed 111 victims Threatened with polygraph: 188 victims Under polygraph: 207 victims

9. February, 20019 The “Undetected” Rapist Special Considerations in Investigations Offender is likely to: Have a smooth interpersonal style Be psychologically sophisticated Quickly shift focus to behavior of victim to undermine her credibility & lay foundation of “consent defense” Have a smooth interpersonal style Be psychologically sophisticated Quickly shift focus to behavior of victim to undermine her credibility & lay foundation of “consent defense”

10. February, 200110 The “Undetected” Rapist Special Considerations in Investigations Possible Avenues of Investigation Can “he said-she said” problem be solved? Remember: majority are serial offenders Investigate offender’s social networks Interview old girlfriends & dates Check for prior complaints/restraining orders Can “he said-she said” problem be solved? Remember: majority are serial offenders Investigate offender’s social networks Interview old girlfriends & dates Check for prior complaints/restraining orders