There are a few potential downsides to using an access control system. Firstly, if the system is not installed correctly, it can be ineffective in controlling who has access to which areas. Secondly, if the system does not have enough security features, it may allow unauthorized persons to enter the facility. Finally, if the system is not regularly maintained, it may fail to function properly. However, the benefits outweigh the negatives and we recommend businesses install them for extra security.