Still, while no one, not even a former president, is above the law, the presumption of innocence is an important tenet of American jurisprudence. We, all of us, even corrupt former presidents, are afforded the rights set forth in the U.S. Constitution when it comes to things like searches and seizures, protections against self-incrimination, and the right to trial by jury.
Two centuries of justice under a constitutionally established rule of law ensures that.
Which is why the criticisms coming from the supporters rushing to the former president's defense in the wake of the search make no sense. Those supporters, many of whom are lawyers, know what due process and the rules of evidence are. They claim to be well-versed in the Bill of Rights. What's more, their phony outrage directly undermines that long tradition of American jurisprudence.
The FBI executes search warrants all the time. Contrary to the fearmongers and conspiracy theorists amongst us, they are not political acts. Not even when directed against a politician. The reason for their use is simple and straightforward — to find evidence of a crime.
The process to obtain a warrant is also straightforward (though not always simple). Investigators and prosecutors working together set forth facts obtained during an investigation to establish a "reason to believe" (also known as probable cause, or PC) that a crime was committed. In the case of a bank robbery, for instance, those facts might include a detailed description of the robber, a license plate of the getaway car, fingerprints, the amount of money stolen, and other information of an evidentiary nature from witnesses, confidential human sources or technical means. Those facts are then presented to a magistrate who reviews them and decides whether or not to authorize the warrant. If a warrant is authorized, investigators proceed to the location to be searched and execute it.
In the matter of the search executed on the former president's residence, all these steps were surely followed. And then some. I speak from experience that a search like this, especially in the current political environment, would have been scrutinized at all levels of the FBI and DOJ before it even went to the magistrate. From a practical perspective, standard PC determinations — like those in a bank robbery — would not have been sufficient. Like it or not, the former president's status as a former president would not have allowed it.