Wouldn't it be better to NOT have Wifi? Especially Wifi that's set up with your bog-standard security (the stuff you plug in an 'just works'?)
If something is being shown in court on a computer, I want it on a cable. Plugged into a known port, with no connection to the outside world and with some sort of cryptographic signing to prove that what you're being shown is the evidence that is supposed to be shown.
I do not understand the mind that would conceive of an insecure, easy-to-spoof system being used in court. You're one Man-in-the-middle from having changed documents inserted, or private testimony leaked. They must have some additional layer of security, they're not daft, but how secure can it be when there's an expectation for it to 'just work, it's only WiFi!'?
And then that feeds a Jury made up of people who, in my experience as a Juror, don't understand what they're there for. But that's another rant...