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They've "solved" the problem, they gave us encrypted flash drives.
Arguments like: these things don't work on Macs or the kind of companies who'd sue us are the kind of companies that will refuse to run a random .exe file (to unlock the encrypted flash drive) on our say so, don't seem to hold much water.
I'd lost the will to argue and was just planning to circumvent them by using a normal drive and wiping it each time but it appears that could be trickier than I thought.
It's your employer's problem then!