Understanding how probable cause guides lawful action, documentation, and policy-compliant decisions for security guards.
Security guards are not law enforcement, but they are also not powerless. In most states, a security guard may act on probable cause, provided the action is lawful, reasonable, and within the limits of citizen-arrest authority and the guard’s post orders and company policy.
Most legal and employment problems in private security occur when guards act at the wrong legal threshold or ignore policy in favor of instinct.
Understanding Legal Thresholds (From Lowest to Highest)
Mere Suspicion — 0%
Mere suspicion is a gut feeling with no articulable facts. It carries no legal authority and does not justify detention, physical interference, or use of force.
At this level, a guard may:
- Observe
- Remain alert
- Document
Nothing more.
Reasonable Suspicion — ~20–50%
Reasonable suspicion exists when a guard can articulate specific, observable facts suggesting criminal activity may be occurring.
This allows:
- Continued observation
- Positioning for safety
- Notification of supervision
Reasonable suspicion alone does not justify detention or arrest for private security.
Probable Cause — 51% or Higher
Probable cause exists when it is more likely than not that a crime has occurred or is occurring, based on objective facts.
For private security in most states, this typically requires:
- Direct observation
- The crime occurring in the guard’s presence
- Clear, articulable facts
Common examples include:
- Theft observed past the point of sale
- Assault occurring in the guard’s presence
- Criminal mischief or property damage witnessed firsthand
At this threshold, a security guard may lawfully act, which can include:
- Issuing lawful commands
- Restricting movement when legally justified
- Detaining or conducting a citizen’s arrest where permitted
- Immediately contacting law enforcement
Probable cause is the minimum threshold for action, not certainty.
BORD (Beyond a Reasonable Doubt) — Conceptually ~100%
BORD is the standard used by judges and juries in criminal court. It is not a field standard and is not required for a guard to act.
However, guard reports often become evidence later evaluated under this standard.
Presence Matters: A Critical Limitation
Unlike law enforcement, security guards generally cannot rely on secondhand information to justify detention or arrest.
In most states:
- The offense must occur in the guard’s presence
- Past or reported crimes usually require law enforcement
- Acting without firsthand observation significantly increases liability
Post Orders and Company Policy Always Control
Even when probable cause exists, a security guard must always follow their post orders and company policy.
Post orders define:
- Authorized actions
- Prohibited actions
- When law enforcement must be contacted
- Whether detention or citizen’s arrest is allowed
Company policy may be more restrictive than the law, and when it is, the policy controls.
Meeting probable cause does not override post orders, client instructions, or company rules.
A guard who violates policy may be:
- Personally liable
- Terminated
- Denied employer support
- Exposed to civil or criminal consequences
What Guards May Do at Each Threshold
| Threshold | Lawful Guard Action |
|---|---|
| Mere Suspicion (0%) | Observe and document |
| Reasonable Suspicion (20–50%) | Observe, position, notify |
| Probable Cause (51%+) | Act if lawful and permitted by policy; contact law enforcement |
| BORD | Not a guard standard |
Common Mistakes Guards Make
- Acting on reports instead of observations
- Detaining without witnessing the offense
- Confusing store policy with legal authority
- Ignoring post orders to “be proactive”
These errors routinely lead to false imprisonment and assault claims.
Documentation Is Critical
Professional reports should use objective language:
- “I observed…”
- “I witnessed…”
- “The subject did…”
Avoid:
- “I believed…”
- “I assumed…”
Your report may be reviewed by supervisors, attorneys, judges, or jurors.
Key Takeaway
- Security guards can act on probable cause
- Probable cause usually requires the crime to occur in the guard’s presence
- Reasonable suspicion alone does not justify detention
- Post orders and company policy always control
- BORD is for the courtroom, not the field
When in doubt: disengage, document, and escalate properly.
Q & A: Probable Cause and Security Guards
Q: Can a security guard detain someone based on mere suspicion?
No. Mere suspicion carries no legal authority. A guard may observe and document, but may not detain, block movement, or use force.
Q: Is reasonable suspicion enough for a security guard to detain someone?
Generally, no. Reasonable suspicion allows continued observation and positioning for safety, but it does not justify detention or arrest for private security.
Q: Can a security guard act on probable cause?
Yes. In most states, a security guard may act on probable cause, provided the action is lawful, reasonable, and permitted by post orders and company policy.
Q: Does the crime usually have to occur in the guard’s presence?
Yes. In most states, citizen-arrest authority requires the offense to occur in the guard’s presence. Acting on secondhand information significantly increases legal risk.
Q: Does probable cause mean the guard is certain a crime occurred?
No. Probable cause means it is more likely than not that a crime has occurred or is occurring based on observable facts. It does not require certainty.
Q: Can a guard ignore company policy if probable cause exists?
No. Post orders and company policy always control. If policy prohibits detention or arrest, the guard must follow policy even if probable cause exists.
Q: Is Beyond a Reasonable Doubt (BORD) required for a guard to act?
No. BORD applies only in criminal court. Guards act at the probable cause level, but their reports may later be evaluated under the BORD standard.
Q: What should a guard do if probable cause exists but policy prohibits detention?
The guard should disengage, document all observations, notify supervision, and contact law enforcement as required by post orders.
Q: Why is documentation so important in probable cause cases?
Because security guards lack qualified immunity. Clear, factual documentation protects the guard, the company, and the client if the incident is reviewed later.
Looking for Professional Security Guard Services in Colorado?
Work with a licensed security company that understands Colorado law, private-property authority, and proper arrest procedures.
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Related Articles:
- Can A Security Guard Search You Or Your Bags?
- Can a Security Guard Remove Someone From Private Property in Colorado?
- Can A Security Guard Arrest Someone In Colorado?
- What Is A Security Guard Personal Statement?
- What Is A Security Guard Incident Report?
- What Is A Security Guard Daily Activity Report?
Legal Disclaimer (PGSS LLC):
This information is provided for general educational purposes only and does not constitute legal advice. Laws and regulations can change, and local, state, federal, and municipal requirements may vary. Always consult qualified legal counsel regarding specific legal questions. Patrol Guard Security Services LLC assumes no liability for actions taken based on this content.
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