I for one think this was the right ruling. In school we studied this dilemma many times. If the police must wait 3 to 5 seconds after announcing their presence, criminals are able to arm themselves and destroy evidence. Imagine serving a warrant on a terrorist cell. Once they heard the police they could simply blow up the entire building. I believe this ruling has more to do with officer safety and preserving evidence than a constitutional matter. Before the police could serve this warrant, they have to be able to convince a judge to sign off on the warrant. This ruling just makes since to me.