DE Security Guard study materials
DE Security Guard study resources

DE Security Guard key terms

DE Security Guard · Get comfortable with the vocabulary.

Citizen's arrest

A limited power under Delaware law allowing a private person, including a security officer acting as a private citizen, to detain someone who commits a felony or certain offenses in their presence. It carries high legal risk and strict limits.

Related: False imprisonment, Detention versus arrest, Use of force continuum
Detention versus arrest

A detention briefly holds a person to investigate or maintain safety without formally charging them, while an arrest takes a person into custody for a criminal charge. Security officers generally may detain only within narrow legal authority.

Related: Citizen's arrest, False imprisonment
False imprisonment

Intentionally confining or restraining a person's movement without lawful authority or consent. A security officer who detains someone beyond legal limits can face both criminal charges and a civil lawsuit.

Related: Civil liability, Detention versus arrest, Excessive force
Trespass

Entering or remaining on property without the owner's permission. Security officers commonly enforce trespass by asking unauthorized persons to leave and documenting refusals for police follow-up.

Related: Premises liability, Access control
Premises liability

A property owner's legal duty to keep the property reasonably safe and warn of known hazards. Security officers support this duty by identifying and reporting unsafe conditions.

Related: Trespass, Negligence, Incident report
Negligence

Failing to act with the level of care a reasonable person would use, resulting in harm. A security officer can be found negligent for ignoring a known hazard or failing to follow post orders.

Related: Premises liability, Civil liability, Duty of care
Civil liability

Legal responsibility for harm that leads to a lawsuit and money damages rather than criminal punishment. Security officers and their employers can face civil liability for assault, false imprisonment, or negligence.

Related: Negligence, False imprisonment, Excessive force
Duty of care

The legal obligation to act reasonably to protect the safety of people on or near the property you guard. The scope of the duty is shaped by post orders, training, and the officer's role.

Related: Negligence, Premises liability
Use of force continuum

A graduated framework that matches the officer's response to the level of resistance or threat, moving from presence and verbal commands up to physical control only when justified. The goal is to use the least force necessary.

Related: Excessive force, Reasonable force, De-escalation
Reasonable force

The amount and type of force a reasonable person would judge necessary to prevent harm or effect a lawful purpose under the circumstances. Force must stop when the threat ends.

Related: Use of force continuum, Excessive force, De-escalation
Excessive force

Force that goes beyond what is reasonably necessary given the threat, or force applied after the threat has ended. It exposes the officer to criminal charges, civil liability, and loss of license.

Related: Reasonable force, Civil liability, Use of force continuum
De-escalation

Techniques such as calm communication, creating distance, and slowing the encounter that reduce tension and lower the need for physical force. De-escalation is preferred whenever time and safety allow.

Related: Use of force continuum, Active listening, Reasonable force
Defensive tactics

Physical control and self-defense techniques taught to protect the officer and others while minimizing injury. Officers may use only techniques within their training and only when justified.

Related: Reasonable force, Use of force continuum
Duty to intervene

The obligation of an officer to step in and stop a fellow officer who is using clearly excessive or unlawful force, when it is safe and feasible to do so. Failing to intervene can create liability.

Related: Excessive force, Ethical duty
Code of ethics

A set of professional standards covering honesty, integrity, impartiality, and respect for the public. Security officers are expected to follow the code even when unobserved.

Related: Ethical duty, Conflict of interest, Professional boundaries
Ethical duty

The moral obligation to act honestly and fairly, protect confidentiality, and put public safety ahead of personal gain. Ethical duties often exceed the minimum required by law.

Related: Code of ethics, Conflict of interest, Duty to intervene
Conflict of interest

A situation where a personal relationship, financial interest, or outside loyalty could improperly influence an officer's decisions. Conflicts must be disclosed and avoided or managed.

Related: Code of ethics, Ethical duty
Professional boundaries

The appropriate limits on an officer's relationships and conduct with the public, coworkers, and detainees. Boundaries prevent favoritism, exploitation, and loss of impartiality.

Related: Code of ethics, Ethical duty
Active listening

Fully focusing on a speaker, reflecting back what you hear, and asking clarifying questions to confirm understanding. It defuses conflict and improves accuracy when gathering information.

Related: De-escalation, Customer service, Radio discipline
Customer service

Treating the public, tenants, and visitors with courtesy, patience, and helpfulness while still enforcing rules. Good service builds cooperation and reduces complaints.

Related: Active listening, Professional boundaries
Radio discipline

Using clear, brief, standardized language on the radio, waiting for a clear channel, and avoiding slang or unnecessary talk. It keeps critical communications fast and accurate.

Related: Active listening, Incident report
Incident report

A written record of an event that documents who, what, when, where, and how, along with actions taken and witnesses. Reports must be factual, objective, and completed promptly.

Related: Observation, Chain of custody, Radio discipline
Observation

The deliberate use of sight, hearing, and other senses to notice details, changes, and hazards while on duty. Good observation requires attention, positioning, and freedom from distraction.

Related: Incident report, Patrol pattern
Patrol pattern

A planned route and schedule of movement through an assigned area that avoids predictability while ensuring coverage. Varying times and routes improves deterrence and detection.

Related: Observation, Access control
Access control

The process of limiting entry to authorized people and vehicles through checks, credentials, and physical barriers. It is a core layer of physical security.

Related: Trespass, Credential verification, Perimeter security
Credential verification

Checking that an ID badge, pass, or document is genuine, current, and matches the person presenting it. Officers should compare photos, dates, and access levels before granting entry.

Related: Access control, Tailgating
Tailgating

Following an authorized person through a controlled door or gate without presenting credentials. Officers reduce it by requiring each person to badge in individually and by watching entrances.

Related: Access control, Credential verification, Perimeter security
Perimeter security

Protecting the outer boundary of a site through fencing, lighting, cameras, and patrols. A strong perimeter provides early detection and delays unauthorized entry.

Related: Access control, Patrol pattern
Chain of custody

The documented, unbroken record of who handled evidence, when, and where from collection through final disposition. Gaps in the chain can make evidence unusable in court.

Related: Evidence preservation, Incident report
Evidence preservation

Protecting physical items, documents, and scene conditions from loss, damage, or contamination until they can be turned over to proper authorities. Officers should secure scenes and avoid unnecessary handling.

Related: Chain of custody, Incident report
Emergency response plan

A written set of procedures that assigns roles and actions for fire, medical, weather, and security emergencies. Officers should know their specific duties under the plan before an emergency occurs.

Related: Evacuation, Incident command
Evacuation

The organized movement of people out of a building or area to a safe location using designated routes and assembly points. Officers direct traffic, assist those needing help, and prevent re-entry.

Related: Emergency response plan, Incident command
Incident command

A structured system that assigns a single person to coordinate an emergency response, with clear roles for operations, safety, and communication. It prevents confusion when multiple agencies respond.

Related: Emergency response plan, Evacuation
Substance impairment

Reduced physical or mental function caused by alcohol, drugs, or medication, visible in slurred speech, poor coordination, or erratic behavior. Officers document observations and follow policy rather than diagnose.

Related: Officer wellness, Incident report
Officer wellness

Practices that protect an officer's physical and mental health, including sleep, exercise, stress management, and seeking help after critical incidents. Wellness supports good judgment and safe performance.

Related: Critical incident stress, Substance impairment
Critical incident stress

The strong emotional and physical reaction that can follow a traumatic event such as a serious injury, violence, or death. Officers should recognize the signs and use peer support or employee assistance resources.

Related: Officer wellness, De-escalation