Card reader as a means of Access Control is becoming popular as compared to a human guard. In this context, which one of the following statements is not correct ?

The statement "It can never fail" is incorrect because card readers, like any electronic or mechanical device, are susceptible to technical malfunctions, power outages, software glitches, and physical wear and tear. While they offer several advantages over human guards—such as being always alert (they do not suffer from fatigue), immune to bribery (they lack human emotions and greed), and generally more economical in the long run due to the absence of recurring monthly salaries—they are not infallible. No technological system is entirely fail-proof, and they often require maintenance or human intervention during system crashes.