police say the officers we are looking at here with helmets and batons will be kept behind the scenes unless they're needed we don't want to have conflicts with people if we don't have to we don't want to clash with people if we don't have two people come here to breasts themselves by all means do it. but do it according to the law, and du, peaceful. it's that simple. once you start to break the law, then we have to restore it. for the piece. >> the officers also received constitutional and legal training on the first amendment, the right to protest. but also how to follow the complex procedures that come into play with mass arrest situations. the convention has a large footprint prime-time programming. it's speeches will be held at the united center while daytime democratic party business meetings and briefings will be held at mccormick place, the official security perimeter is still in development, but the secret