Three things to consider when hiring security guards.
1) What needs to be protected? Do the guards have training or experience protecting the type of thing you need protected?
2) What level of protection is needed? Do you need someone to walk personell out to there vehicals or be on site at all times or do you simply need a mobile patrol to drive through your parking lot at random times?
3)Third is what plan fits the budget you have available.
Security guards can be posted at particular locations to monitor entrances and watch people going to and from buildings. They can also provide some control to crowd flow and provide directions. They can also accept discourage misbehavior in many situations. Guards also patrol and monitor property to be mindful of situations that can cause fire or potential liability for the owner of the premesis and can be on the lookout for any illegal activity.
The benefits of using a security guard service is that the company has done the background checks and training has been provided. Also security services already have all of the supplies and uniforms needed to provide the security services required.