Well, you'll probably hear that from some of a more Libertarian bent here on FR....But neglecting that, and directing our attention to Muawiyah's case, it's a rather well developed point of 4th amendment law that an on-duty cop and or fireman would certainly have acted lawfully by doing the exact same thing as muawiyah did. Know a guy who did just that not all that long ago, as a matter of fact.
Taking things a bit further though, if upon entering to effect a rescue of the occupants of the burning structure, the cop noticed contraband in plain view (say, a bunch marijuana plants and grow lights on fire), the evidence thus obtained would be admissable anywhere in the US.
Having never heard that from any of them, I find that a dubious proposition.
Given that, whatever follows becomes eqully suspect.
Fire I went into was so hot it melted a coin collection. If that lady had MJ in there it was thoroughly roasted and turned to ash.