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Originally Posted by Marcus Aurelius You have got to be fucking kidding me. Seriously, did these guys just walk into people's homes without warrants?

Under the Exigent circumstances exception to the Fourth Amendment they can however there are limitations;

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http://www.law.cornell.edu/wex/exigent_circumstances Circumstance that require an immediate response. An exception to the general prohibition on a warrantless arrest or search. Occurs when police officers believe they have probable cause and there is no time to obtain a warrant http://www.lexisnexis.com/lawschool/.../crimpro03.htm § 3.05 Exigent Circumstances Exigent circumstances can justify a warrantless entry of a home to make a felony arrest or to conduct a search related to a serious offense under the following circumstances: (1) hot pursuit of a fleeing felon; (2) imminent destruction of evidence; (3) the need to prevent a felon's escape; or (4) risk of harm to the police or others.