It is unlikely that you would be able to prevail in your claim against the police because the police had probable cause to enter the house without a warrant.  The probable cause was based on their on-scene investigation of the report from the neighbor of underage drinking.  Also, when the police looked in the window and saw alcohol, party cups, and underage kids, all of these items were in plain view which would support a finding of probable cause to enter without a warrant.  Probable cause means a reasonable belief that criminal activity (underage drinking in this case) is afoot.Under these circumstances, the police would be able to enter the house without a warrant.  If the police were required to obtain a warrant in this case, by the time they obtained the warrant and returned, the alcohol, party cups, and underage kids would be gone.