The Electronic Surveillance Unit (ESU) assists investigative and intelligence gathering units within the Division of State Police. Additionally, ESU provides technical collaboration and support to other state, county, local and federal law enforcement agencies in the region. The Electronic Surveillance Unit procures and distributes audio and video surveillance equipment for the Division of State Police and is tasked with the maintenance of that equipment.

In the course of supporting criminal investigations, ESU members supply detectives with specialized electronic equipment needed to capture evidence for a successful case conclusion and prosecution. Case specifics and equipment used by the Electronic Surveillance Unit are of a confidential nature. To protect the integrity of the means and methods used to gather investigative leads and evidence of crimes committed details are not provided. Members of the Electronic Surveillance Unit provide the technical assistance needed by detectives in the field when an investigation leads to a communications intercept. The investigators from this unit provide expert advice, as it pertains to state and federal laws governing these types of investigations and additionally facilitate this part of the investigation.

The Electronic Surveillance Unit is a highly specialized assignment, which requires special investigative and technological skills. To enhance these skills, investigators from this unit are members of professional organizations including the National Technical Investigators Association (NATIA) and support the Federal Bureau of Investigations, Communications Assistance for Law Enforcement Act (CALEA) working group.