How about a Wifi jammer?

There are specific WiFi jammers available almost everywhere on the internet, and WiFi jammer is relatively easy to make for those with electronics and soldering experience. One of the more popular homemade WiFi jammers, also known as the Wave Bubble, is a portable RF WiFi jammer small enough to fit in a pack of cigarettes. This WiFi jammer is adjustable and can be used to jam cordless phones, GPS, WiFi, and Bluetooth jammer devices, and more.
https://www.jammer-mart.com/wireless-wifi-bluet…
Use of Jammers If you're a professor and you're taking final exams this quarter, a wifi signal jammer can be very useful. The exam room is packed with students who might be using a WiFi jammer device, and it's almost impossible to tell who might actually be using a WiFi device to cheat. Now, if you installed a wifi frequency jammer to block WiFi connections during testing, you've solved at least one of the problems.
The point is that a wifi jammer kit can be useful, especially if you can block a designated area, you can also use it as the best WiFi jammer.

This might work for government departments who need wireless wifi jammers in certain areas, but they don't want WiFi leaks. I know large organizations don't use WiFi for security reasons, but if there was a way to use a wifi jammer to control where WiFi exists, then this wifi jammer could be very, very useful.
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