Switzerland laws don't have an overall prohibition expressed that directly. Moreover the videosurveillance and system surveillance are treated separately even if some common laws apply.
The intent of the surveillance and the communication to employees is more relevant thant the technical means.
In short, a surveillance system is prohibited if it is intended solely or primarily to monitor the actual behaviour of employees. However, the same system will not be prohibited if it is used for on legitimate reasons, such as ensuring safety or enabling the organisation or planning of work. However, the system chosen must be proportionate to the aim pursued and the employees must be informed in advance
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