For example, I have noticed on things like 'War of the Roses' etc. the person they are looking for never fails to answer the phone, and never hangs up on them. What are the chances of that? Is it all pre-recorded? Or worse, scripted?
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It's assumed that those types of things are fake. Prank calls are certainly fake as it's illegal to record someone without their knowledge. which obviously ruins the bit for them. If you recall that show Crank Yankers, they all had to fly to Nevada because it was the only place where you actually could record them and not tell them.
I believe there is a service for radio shows for bits and what not.
That isn't to say all things heard on the radio are fake, but if it comes from the more hokey type shows, I wouldn't believe it.2