Or they won't. And they'll lie to a judge, and they'll lie to a doctor, and they'll lie to the assistant US attorney. They'll create an insane and false chain of probable cause to accuse you of having drugs up your ass. You'll be taken (while cuffed, and chained to a van) to MULTIPLE hospitals against your will and be seen without your permission (without an arrest, without a warrant, and without a court order, and without any psych hold), each of which sends you a multi-thousand dollar bill. You'll wonder when the lawsuit will end up getting served for the medical bills for a medical condition you never had that the agents made up. You will complain to the state medical/nursing board, and they'll tell you nurses can search and perform 'care' on you without a warrant, probable cause, any emergency, consent, an arrest, nor a court order -- and DHS will exploit this loophole to violate what few 4th amendment rights you do have at the border. The DHS agents will smile inside knowing they can weaponize the high cost of fake medical complains while under your detention to rack up debt in your name.

Later you contact an attorney, and find out the agents have qualified immunity, that suing is a financial black hole that you probably cannot afford, and that your best chance is to be some incredibly sympathetic mother-teresa kind of character that are one of the one per 10,000 or whatever ACLU takes up for a cause.

These are not theoretical. This is what they've done to me, and more.