Police caution that other recording devices like the one found in a Plano recreation center could be in bathrooms and changing areas around Dallas/Fort Worth.
The camera found in Plano was was disguised as an air freshener, and Plano police say other devices could also be camouflaged in some way.
"That doesn't necessarily mean that's what all the devices are going to look like," Officer David Tilley said.
The evolution of technology makes tracking recording devices even more difficult.
"It has changed an enormous amount in 15 years," said Michael Dear, who owns Spy Centre Security.
His company sells cameras and security deterrents, mostly for companies tracking employee theft or securing a facility.
A camera can be anywhere or look like anything "from air fresheners to clocks, to clock radios, to mantle clocks, to iPod-docking stations, to buttons on your shirt," Dear said.
A 12-volt transformer -- something one would normally see plugged into an electrical outlet -- with a little camera is one example, he said. It records based on motion and can be set up on a schedule.
Police found motion-activated cameras in the home of the man accused of setting up the camera at Oak Point Recreation Center, according to the search warrant.
Christopher Furber, 43, faces charges of improper photography or video recording in the case.
Plano police said they have swept all public buildings for other recording devices but others could lurk in other cities or in privately owned facilities.