Senator Ron Wyden and Rep. Shontel Brown are calling for an investigation into the vulnerability of modern computers to what the NSA calls TEMPEST: spy techniques that pick up devices' accidental electromagnetic/radio/acoustic emissions to learn their secrets. https://www.wired.com/story/how-vulnerable-are-computers-to-an-80-year-old-spy-technique-congress-wants-answers/
@agreenberg Answer: Very.
If you want to secure laptops against compromising emanations, prices go up by a factor of at least x3. It's not feasible or cost effective to TEMPEST proof your non-classified computers, education is your best tool.

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