Go through the security service crew. A good security company should have some names of law enforcement departments and also from the military.
Known about the security system that offers a demonstration of the service they offer. Attend this demonstration with attention and try to understand if they fit what you are looking for. If you are searching online for security services in Australia then you can have a peek here https://tradetechservices.com.au/.
Interviewing personnel with specific questions. If you have a specific service in mind that these companies are not mentioned, ask them. For example, if you want them to run a thorough search of the background of all your employees, tell them what you are looking for.
At times, people working undercover and they take every possible protection to maintain cover. You need to decide how in-depth you want your employee records to be checked.
Check the license of the security services. Contact an agency that is responsible for keeping a record of the license for such enterprises. This will give you accurate information and also saves time and work while reviewing the company.
Ask about security cameras and positioning them so that the workspace is left with no blind spots. You might also consider placing a camera in which people cannot see them allow you to detect unusual actions when their guard down. Install surveillance in the various points so that no unusual action gets ignored. The following points can help you to find an effective security service.