Having once been on the periphery of various TSCM sweeps, I'd say that modern devices are becoming increasingly hard to detect, especially with domestic grade equipment.
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Most of the time, a physical examination will locate more suspect devices than electronic means, but it is VERY time-consuming, and costly if you get a professional to do it for you, but even then you can't be 100% certain you are in the clear, as so many companies outsource the work, and you never know how competent the technician may be.
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Devices used at a corporate / government level are even harder to find, and 20 odd years ago they were already incredibly sophisticated, so goodness knows how much more advanced modern day devices are likely to be.
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However, it still remains a lot easier to obtain information by other means, particularly though various forms of social engineering.
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Regards,
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Martin
