Hi WW
You said, quite rightly:
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The computer system is for work only not a toy for the employees to play with and they are told such when they get hired.
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But I did say:
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those same sniffers can capture employees private data as well, such as a confidential private emails, credit card numbers (used when shopping during lunch time) and or various online account details
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So unless you specifically ban online shopping, which would be considered unreasonable and not using the system as a toy, then using your "sniffer" to gather data other than to protect your network may be problematic.
However, if extra unintended confidential data is collected then timely deletion of that data should free you of any obligation.
UK Bob