Across the country, miniaturized hidden cameras keep popping up in the most unseemly location: public restrooms, where latter-day peeping Toms record every zip, wipe and flush of unsuspecting victims.

When you’re traveling, the last thing you want to think about is someone spying on you. But in a 2019 survey by real estate company IPX1031, 11 percent of respondents reported finding a hidden camera ...