Yeah, everyone's been over it pretty well, but I thought I'd just confirm things. Search incident to arrest is fine to protect a cop's safety. Generally, that's just plain sight and whatever is in the suspect's reach. Getting a search warrant after executing an arrest is usually pretty darn easy. If you had probable cause enough to convince the clerk magistrate that you needed an arrest warrant, you can usually bootstrap your search warrant on merely that evidence. Technically, you have to wait, though, to get the second warrant to do anything other than a plain sight/safety search. There are mitigating circumstances if a cop believes a crime is in progress and there are other people in danger. So if you bust into a murder scene, you can search for other potential victims or people who were attacked and may still be alive, but no going through drawers.
