According to TwinGalaxies, well-known cosplay photographer Michael Benedict has allegedly admitted to hiding camera in the changing room of a studio he uses, and illegally recording people.
See for yourselves and make your own conclusions:

The photog was Michael Benedict. A well known photog in the socal cosplay scene…
— Luciferbob (@LuciferBob) February 11, 2019
Why it’s so important to always take a friend with you even if you trust them pic.twitter.com/v0lf7wxibc
Links to his public accounts so you can see if you have worked with him before: Facebook – Instagram
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