They should really invest in a few freestanding partitions or something
When someone is murdered and they have interviews with the spouse throughout the episode, sometimes it's really obvious the spouse is in prison. The background may be out of focus, maybe it's filmed really close to try and hide it, but those techniques just make it more obvious.
MAYBE there's the chance that they're in prison on an unrelated issue, but that's probably a long shot.
Can't they just give them a nice shirt to wear, throw up a partition behind them so it looks like they're just sitting in a normal room like all the other people being interviewed?
Voiceover: "The husband had an alibi, the police cleared him of any involvement"
Me: "Then why is he obviously being interviewed for the show in prison?"