What Is “Reasonable Grounds” for Security Guards?
If a security guard stops someone, asks them to leave, or makes an arrest—there must be a reason.
Not a guess. Not a feeling.
A reason based on facts.
That’s what the law calls “reasonable grounds.”
What Does “Reasonable Grounds” Mean?
Reasonable grounds means having clear, factual reasons to believe something has happened or is about to happen.
In Canada, this concept is used in laws like the .
https://laws-lois.justice.gc.ca/eng/acts/c-46/
For security guards, it applies to decisions like:
Detaining someone
Making a citizen’s arrest
Using force
Enforcing trespassing rules
Why Reasonable Grounds Matter in Security
Every action a security guard takes must be justified.
Without reasonable grounds:
The action may be unlawful
The guard and company may face liability
The situation can escalate unnecessarily
In simple terms:
No reasonable grounds = no legal authority to act
What Counts as Reasonable Grounds?
Reasonable grounds are based on what you can clearly observe or verify.
Examples of Reasonable Grounds
Seeing someone conceal an item and leave a store without paying
Watching someone damage property
Observing someone refuse to leave after being told
Receiving reliable information from a witness and confirming details
These are fact-based situations
What Is NOT Reasonable Grounds?
This is where mistakes happen.
Not Reasonable Grounds:
Acting on suspicion alone
Profiling based on appearance
“They looked nervous”
Following someone without any clear behaviour
Assumptions are not evidence.
How Reasonable Grounds Apply to Security Work
1. Citizen’s Arrest
A guard must have reasonable grounds to believe:
A crime is being committed, or
It just happened
Example:
A guard sees someone steal merchandise and leave.
This supports a lawful arrest.
2. Detainment
Detaining someone—even briefly—requires justification.
Example:
Holding someone because you “think” they stole something is not enough.
3. Use of Force
Force can only be used when:
There is a real and immediate need
The response is proportional
Without reasonable grounds, force may be considered excessive or unlawful.
4. Trespassing
Security guards rely on reasonable grounds to enforce property rules.
Example:
Someone refuses to leave after being directed—this supports enforcement under trespassing laws.
Real-World Example
A security guard in a retail store notices:
A person picks up an item
Hides it in their bag
Walks past checkout without paying
The guard:
Observed the full sequence
Has clear facts
This is reasonable grounds for action.
Now compare:
A person is walking around the store and looks around frequently.
The guard:
Has no clear evidence
Has not seen any theft
This is not reasonable grounds
How Security Guards Use Reasonable Grounds Daily
Professional guards are trained to:
Observe carefully
Confirm details
Avoid assumptions
Document what they see
This protects:
The public
The property
The security team
Common Misconceptions
“If something feels off, you can act.”
No—there must be observable facts.
“Security guards can stop people just to check.”
No—there must be a valid reason.
“It’s better to act first and figure it out later.”
No—this creates legal risk and liability.
Why This Matters for Businesses
For property managers and business owners, this is critical.
Improper decisions can lead to:
False arrest claims
Lawsuits
Damage to reputation
Well-trained security teams:
Understand legal thresholds
Act based on facts
Follow proper procedures
Learn More About Professional Security Services
If you’re reviewing your current security setup, understanding concepts like reasonable grounds is essential.
Explore our services here:
Strong security is not just about presence—it’s about making the right decisions at the right time.
Final Answer
Reasonable grounds means having clear, factual reasons to act.
For security guards, it is the foundation of:
Arrest
Detainment
Use of force
Trespass enforcement
Without it, action becomes risk.
With it, security becomes lawful, professional, and effective.