The business that chooses unarmed Security Guards 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 big offices have to hire a large team of security personnel who also have the weapons on duty, and concurrently, who will also keep an eye on everyone who is coming to the premises.
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https://www.mysecurityguards.com/blog/armed-or-unarmed-which-security-service-is-best/