Third-party access to the office: Physical barriers and visitor procedures
You now know that the primary purpose of office security is denying unauthorised people access. One or several people could enter to steal, acquire information, plant something which can later be used against you, such as drugs or weapons, threaten you, etc. Every case is different, but the aim remains the same: Avoid it.
Access to a building is controlled through physical barriers (fences, doors, gates), through technical measures (such as alarms with lighting) and visitor admission procedures. Every barrier and procedure is a filter through which anyone who wishes to gain access to the office must pass. Ideally, these filters should be combined to form several layers of protection, capable of preventing different types of unauthorised entry.