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/
How Vulnerable Are Computers to an 80-Year-Old Spy Technique? Congress Wants Answers

A pair of US lawmakers are calling for an investigation into how easily spies can steal information based on devices’ electromagnetic and acoustic leaks—a spying trick the NSA once codenamed TEMPEST.

WIRED

@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.