Investigator Guide

Collaborating to Catch a Predator Webinar

Watch the Webinar

Sex offenders may be considered the bane of society that they are required to be registered. But not all of them are as compliant which then puts communities at risk. As result, law enforcement and other agencies in charge of public safety are observing proactive measures to ensure that they have updated information on these offenders, keeping them a step ahead.

Adam Kirhagis and Christine Mullin discuss the importance of data and collaboration to catch these individuals. Adam was a Detective Sergeant at the Baltimore Police Department where he supervised the sex offender registry and investigation of crimes against children. He is currently with OffenderWatch, a tech-based organization that streamlines sex offender registry and integrates with various networks for a more comprehensive search capability. Christine is a Sex Offender Compliance Investigator for the Harford County Sheriff’s Office. Her 23-year career had her working as a trooper and criminal investigator.

Topics they discussed in this session are:
  • Instances where the sex offender did not show up for an appointment.
    • The probable reasons why sex offenders fail to register.
    • What the Sex Offender Registry (SOR) Unit typically does and the due diligence involved to bring these individuals into compliance.
    • Tips on how to ensure offenders are compliant and do not fail to register.
  • The three types of data that are typically collected for sex offender registries, the information that must be noted in case management, collecting offender data for support and accountability purposes, and the other entities that can benefit from this.
  • Cases where the sex offender is willfully non-compliant.
    • Verifying offender data and utilizing data source partners to obtain information that can provide accurate information and leads to the offender.
    • Preparing a warrant for failure to registry, getting to the offender, and arresting the offender for non-compliance.
  • Dealing with absconding sex offenders and expanding into a multi-agency investigation that may include federal resources.
    • Utilizing the USMS National Sex Offender Tracking Center (NSOTC) to inform the feds of the absconded sex offender.
    • Leveraging US Marshals and ICE for reinforcement with the leads and search.
  • Conducting compliance operations to find all sex offenders
    • The different databases and resources in the local, state, and federal level that can be searched.
    • Step-by-step guidelines on how to prepare and conduct a field initiative.
  • How data gathered through the SOR and OffenderWatch can be valuable in child abduction cases.
  • Case studies were presented showing the value of a comprehensive sex offender data collection and using OffenderWatch as a force multiplier in resolving non-compliant and absconding sex offender scenarios as well as large scale compliance operations and child abduction cases.


In the webinar, you’ll learn:
  • What is the best way for the local registry staff to work with neighboring jurisdictions as well as State, US Marshals, NCMEC, and Probation?
  • What data in the sex offender registry is useful to investigators?
  • How can investigators get access to registry investigative tools and share information securely between state, local and Federal agencies?
Audience Comments
  • “Everything was very valuable information including the resources provided.” — Illa
  • “Reinforcement of the need for law enforcement, corrections and other agencies need to work together to keep society safe.” — Chris
  • “I enjoyed learning about the different tools and processes regarding locating sex offenders.” — Desiree
  • “This is the best webinar I have attended. Lots of great information without a lot of fluff. Thank you for presenting the contact information to gain access and to be able to outreach to more jurisdictions when it comes to tracking or locating those offenders who have absconded.” — David
  • “Very organized webinar! I really enjoyed the real life cases.” — Kathryn
  • “Amazing webinar! Loaded with valuable information. Thank you!” — Kathy
  • “It was informative to learn just exactly everything that is looked at during a compliance check. I enjoyed this presentation very much, and found it incredibly helpful, and relevant to my job.” — KATELYN

Your Speakers

Retired First Sergeant Christine Mullin earned her Bachelor of Science Degree in Criminal Justice from the Saint Edward’s University in Austin, Texas.  She spent 23 years as a Maryland State Trooper serving and protecting the citizens of Maryland.  While serving as a Maryland State Trooper, First Sergeant Mullin worked 16 of her 23 year career as a criminal investigator.  Her assignments over the years provided extensive experience in child sexual abuse investigations, major narcotics investigations, asset forfeiture investigations and property crimes.   Upon her retirement in 2018, First Sergeant Mullin was recruited by Sheriff Jeffrey Gahler of the Harford County Sheriff’s Office for employment as a Sex Offender Compliance Investigator where she remains employed today.

While a Detective Sergeant at the Baltimore Police Department, Adam Kirhagis supervised the Sex Offender Registry Unit registering, managing, and tracking Baltimore’s 1500+ registered sex offenders. He supervised a team of 6 detectives investigating crimes against children while managing a multi-disciplinary approach from complaint to prosecution. In 2018, Detective Sgt Adam Kirhagis retired from BPD and joined OffenderWatch. As a Territory Manager at OffenderWatch, he can leverage his 27 years of law enforcement experience to help registering agencies develop best practices in sex offender management, collaborative investigations, and public notification.

Download Our Guide for Collaborating on Investigations

Learn more about Failure to Register Investigations, multi-agency investigations, compliance operations, and abduction response.


Meet Other Investigators and  Learn More

Join us at the OffenderWatch Symposium May 24 – 27, 2021 in New Orleans


What to Expect

  • Inspiring National Keynote speaker
  • Over 250 participants from 32 states, tribes, and Canada
  • Workshops on Best Practices, SOR Issues
  • Breakout Sessions, Panel Discussions and Case Studies
  • Hands-on Classes for OffenderWatch Training
  • Experienced law enforcement presenters including FBI, State & Local registering agencies
  • Time to Network with the experts
  • Meet one-on-one with the OffenderWatch Support Desk Team


Need help using OffenderWatch on your investigation? 

We can show you how add investigators,

  • perform an investigative search using partial data and fuzzy searches
  • generate a radial map of offenders around a crime scene
  • add investigators and share investigative notes
  • generate a detailed report on an offender in preparation for a warrant or court case     
  • involve the US Marshals, NCMEC
Talk to a Human.  Call us at 985-871-8110 or complete the form below.


Don’t have access to OffenderWatch? 

Law enforcement investigators may request access to OffenderWatch in any of our 3400 local and tribal registries or 21 statewide registries by contacting your local sex offender registry. US Marshals also may have access to OffenderWatch.  Complete the form below so that we can assist you with gaining access to the OffenderWatch Network of registries.    

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