Hello, I hope this is the right place to ask this, since it is business related, I have a business opportunity here to purchase devices that can effectively jam communication signals within a stipulated area i.e building. For instance, if the police were about to raid a building where suspects lurk, there will always be someone who will use a cellphone or a walkie talkie to warn the rest and all would have fled by the time the team arrived and all evidence destroyed or removed. Is there a way to jam up any mobile communiocation signals withi an area using a device or such? I have a buyer here in my country looking to invest/purchase around a million USD if anyone can introduce such device and it is proven to be effectve. Don't post replies to this thread, PM me with details if you you have leads. Of course you will be given a fair compensation if the deal gets through. We can arrange that safely so that you will be well compensated.