it works

SPYFLOOR is an underground detection system. Unlike sideways and overhead detection systems, SPYFLOOR technology is designed to  avoid inaccuracies from clothes,  hats, briefcases and other accessories that may be incorrectly identified by normal detection systems.

See for yourself
How many people?
Just count how many feet!
Hats and backpacks do not impact results.
Suitcases pose no problems.
All types of shoes detected.
Distinguishes feet from objects like umbrellas and canes.
Too many feet = too many people.
With a high-speed refresh rate (100 frames per second), even someone who tries to run will be detected.