Knowing that a person convicted of rape and kidnapping built a soundproof building on their property would make a HUGE red flag go up in my brain. I would want to reassure myself that it was actually being used for the purpose intended as it was isolated from the residence. I would hope any LE officials in the future realize the seemingly innocent items that can be used for evil and take a closer look at the environment around them!
there aer so many red flags here. it would cause a stampade in spain