The fourth amendment protected every citizens in united states from unreasonable searches and seizures. This means that if police want to search for evidence from private property, the search need to be conducted with a warrant.
But, in the case above, police was not the one that took the evidence. It was another individual who later gave the evidence to the police.
So technically, the police wasn't conducting any search that protected by the fourth amendment.
Compared to the confederation principle of the Articles of Confederation, federalism was a step toward a step toward the greater centralization of power in the national government .
