Well there is actually, you can take peoples devices off them when they enter/work at a facility. There are already plenty of examples of this in NZ. You can also design the workplace for visibility (open with transparent partitions) such that any illegal behaviour is more difficult. And you can use security cameras as a final deterrent. But thats a hardcore approach.
From an IT perspective a better approach is to audit all data access, and with modern tools it's possible to observe unusual patterns of behaviour. For example an employee viewing data they have no valid reason for, or viewing lots of data records. I believe Police already do this to some extent (from other stuff in the news).
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