Your employer will have agreed ways of working in place to protect sensitive information. For example, electronic information should be protected by a firewall and a password. These passwords should only be shared with those who have permission to access the information concerned. There will also be procedures for paper-based systems such as where the files are kept and the procedure for access.
It is important to have these secure systems in place because any individuals you care for have a right to confidentiality. When they tell you something, they are trusting you to protect their information and prevent it from falling into the wrong hands. If your organisation’s systems are not secure, you are not only betraying the individual’s trust, but there will likely be legal consequences as well. As such, you should always ensure your organisation’s systems are secure.