All of these are much more complicated and expensive than just sending someone off in a stolen car to fire some shots wherever you'd like the cops to be in 20 minutes or so. Convenient leash.
I'm sure there are ways to make a gun shot sound without having an actual gun, too. If police responds every time within a few minutes, it's also very easy to find out which device/firework will do.
Depends on who's doing it. For career criminals, sure the stolen car and gun are probably easy. If it's anybody else, say some bored high school kids, then the speaker is probably a much easier option.
Yep. I guess using a gun didn't cross my mind as possession is illegal here in this part of Europe (unless you are licensed, screened, store it safely, etc etc).
