The business that chooses unarmed security services over the armed ones is usually at low risk. Those who have less equipment and fewer employees in the office can always go for the unarmed security forces. And The business that has more assets and a large number of employees usually hires the armed security services because the chances of crimes at such places increase.

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https://www.mysecurityguards.com/blog/armed-or-unarmed-which-security-service-is-best/