Good luck with that. There are multiple reasons cops use to do a search if they want to. Probable cause can range from seeing something sticking out from under your seat, speeding, suspicion of being under influence, or being in proximity of another crime. Pair that with the incentive of civil forfeiture profits and it’s not looking like a good idea to travel with 25k
I am convinced that if the American police forces wish to detain, arrest, or take your money, they will find a reason to do so, or create one where none was there before. Assets forfeiture, detainment, and arrest without legitimate judicial reason is deeply unfair. Regardless of innocence that may be found and adjudicated later, the damage to ones reputation, employment, and even banking can be disastrous. Recourse is often costly or non-existent.