Security guards in Colorado are tasked with protecting life and property — but their authority to use force is limited by law. Unlike law enforcement officers, guards are private citizens and must follow specific statutes that govern when and how force can be legally used.
This guide explains Colorado’s use-of-force laws and how they apply to security guards, including:
- Self-defense (C.R.S. § 18-1-704)
- Defense of property (C.R.S. § 18-1-705)
- Trespass and theft prevention (C.R.S. § 18-1-706)
- Force by peace officers (C.R.S. § 18-1-707)
- Shopkeeper’s Privilege (C.R.S. § 18-4-407)
🔹 C.R.S. § 18-1-704 – Use of Force in Self-Defense or Defense of Others
A security guard may use physical force when they reasonably believe it is necessary to:
- Defend themselves or another person from imminent use of unlawful physical force
Deadly force is only justified if:
- The guard reasonably believes it is necessary to prevent death, serious bodily injury, sexual assault, kidnapping, or robbery
Key Takeaway: The force used must be reasonable and proportional to the threat. If the threat stops, the force must stop. Whenever possible, guards should attempt to de-escalate before resorting to force.
🔹 C.R.S. § 18-1-705 – Use of Force in Defense of Property
Security guards are allowed to use reasonable, non-deadly force to:
- Prevent or stop an unlawful intrusion or interference with real or personal property
However, deadly force is not permitted solely to protect property. It can only be used if there’s a simultaneous threat of serious harm or death.
🔹 C.R.S. § 18-1-706 – Use of Force to Prevent Theft or Trespass
Guards may use reasonable and appropriate non-deadly force to stop:
- Theft
- Criminal mischief (property damage)
- Trespassing
Once the suspect flees or the crime stops, any continued use of force is no longer justified and may be considered assault or unlawful detention.
🔹 C.R.S. § 18-1-707 – Use of Force by Peace Officers
This statute applies only to peace officers (POST-certified law enforcement).
However, subsection (2)(c) allows a private person to assist an officer in making an arrest if ordered to do so by the officer:
“A peace officer may use physical force… and a person assisting at his direction may use reasonable and appropriate physical force.”
Security guards do not have the authority of peace officers, but if law enforcement gives a lawful order to assist, they may do so using reasonable force under that officer’s direction.
🔹 Citizen’s Arrest in Colorado
Colorado law does permit a private person — including a guard — to detain someone if they have knowledge a crime has occurred (not just suspicion). However, this carries high legal risk and should only be done:
- When the offense was committed in the guard’s presence
- With the minimum force necessary
- While immediately notifying law enforcement
Even though legal, citizen’s arrest by security guards is discouraged unless absolutely necessary and should follow company policy and legal guidance.
🔹 C.R.S. § 18-4-407 – Shopkeeper’s Privilege
Colorado law recognizes a guard’s right to briefly detain and question someone suspected of theft, as long as it is done lawfully and reasonably.
C.R.S. § 18-4-407 permits:
“If any person triggers a theft detection device or conceals unpurchased merchandise and a merchant or employee detains them in a reasonable manner and for a reasonable time, they shall not be liable for false arrest, false imprisonment, slander, or unlawful detention.”
Conditions to Apply Shopkeeper’s Privilege:
- You must have probable cause (reasonable grounds to believe theft occurred)
- Detention must be in good faith
- Detention must be done in a reasonable manner
- Detention must last a reasonable amount of time
- Law enforcement should be contacted immediately
⚠️ Use of excessive force, threats, or unlawful searches voids these protections and can lead to criminal or civil liability.
✅ Summary: What Security Guards Can Do in Colorado
| Situation | Can a Guard Use Force? | Notes |
|---|---|---|
| Self-defense / Defense of Others | ✅ Yes | Must be reasonable and proportional; deadly force only for serious threats |
| Defense of Property | ✅ Yes (non-deadly only) | Cannot use deadly force to protect property alone |
| Preventing Theft or Trespass | ✅ Yes (non-deadly only) | Only while crime is in progress |
| Detaining Suspected Shoplifters | ✅ Yes (under C.R.S. § 18-4-407) | Must meet all legal conditions of shopkeeper’s privilege |
| Deadly Force for Property Crimes | ❌ No | Not justified unless combined with serious bodily harm threat |
| Use of Force Off Property | ❌ No (except under citizen’s arrest laws) | Not recommended due to high liability |
| Assist Officer if Ordered | ✅ Yes | May assist LEOs using reasonable force under 18-1-707(2)(c) |
🛑 What Security Guards Cannot Do
- Use force to punish or retaliate
- Continue force after the threat ends
- Chase and tackle suspects off property
- Conduct physical searches without consent
- Detain someone without probable cause
📝 Reporting and Liability
Even when justified, all uses of force must be documented in an incident report. Guards must be trained to articulate:
- The perceived threat
- The level of force used
- How it was proportional
- When the force ceased
Improper use of force can lead to:
- Termination
- Civil lawsuits
- Criminal charges
📢 Ready to Train Professionally?
Understanding Colorado use-of-force law is just the beginning. Whether you’re new to the industry or need recertification, we offer professional security guard training that covers legal authority, force options, reporting, de-escalation, and more.
👉 Click here to learn more about our Colorado Security Guard Training.
⚠️ Legal Disclaimer
This article is for educational and informational purposes only and is not legal advice. Colorado law is subject to change, and legal interpretations can vary. Always consult a qualified attorney or supervisor for guidance on use-of-force policies and liability issues.
