Get a warrant. Don't just hand your property over to the police. Why not just hand over your 4th amendment rights on a platter to the terrorist police state while you're at it?
Get someone with an education to read the Constitution to you.
The 4th Amendment (and the Miranda decision by the way) only applies IF YOU HAVE BEEN ACCUSED OF A CRIME AND HAVE BEEN ARRESTED. You can be subpoenaed as a witness to a crime. If you refuse, a bench warrant will be issued for your arrest. The charge? Contempt of court, complete with fines and jail time.
If you have been arrested and were NOT given the Miranda warning (get someone with an education to explain that to you), then your admitting to a crime can be struck down in court and the case tossed.
The wonderful STATE (that you worship on a daily basis when it takes money from me to award you welfare checks) can basically do anything it wants with you in the process of prosecuting a crime.
Search warrants are given to search the domiciles of suspects of a crime. If you are accused and the evidence is in your car, the officer can call a judge for a search warrant.
Each state has its own penal code and its own Rules of Criminal Procedure. Because my degree was in Florida, here's our rules.
https://www-media.floridabar.org/uploads/2020/04/Criminal-Procedure-Rules-4-6-20.pdf
I can't say I have that much experience in criminal law. What few temp jobs I took at law offices were for big ticket class action suits. (AND YOU DON'T KNOW PAPERWORK UNTIL YOU'VE HAD TO SPEND A WHOLE DAY IN ONE ROOM WITH A SINGLE PERCENTAGE POINT OF SUCH A CASE.)
You probably didn't know that you can be arrested for having $10,000 cash on your person, for whatever reason. It can be seized and never given back to you, even if you committed no crime at all. Even if you were taking the cash to buy a car (which is REALLY stupid today, since there's this wonderful invention called the Debit card), if you are caught with it, you go to jail. And that's the way it has been throughout the 80s to now, DEmocrat or Republican presidents notwithstanding.