Among other things that CBP does not need a warrant to search or seize anything and everything at a border. Everything is subject to search at the border. To make a seizure all that is needed is reasonable cause that customs law/regs were violated. And there are specific federal laws relating to thwarting such seizures.
If you don’t want something searched do not bring it across the US border. There is very clear constitutional and statutory authority for these searches.
If you don’t want something searched do not bring it across the US border. There is very clear constitutional and statutory authority for these searches.