US CBP and other national border agencies change target priorities from time to time, which is reflected in the questions they ask you. I recently had a long d

US CBP and other national border agencies change target priorities from time to time, which is reflected in the questions they ask you. I recently had a long discussion with CBP about my Canadian passport showing a US birthplace. Under a repealed section of the INA my US nationality lapsed some half a century ago and I suspect a call was made to the Port Manager. Since then my entries have not discussed this point which leads me to suspect their system has been updated. The current question is your plate number (already displayed by the camera). You need written permission from the vehicle owner to cross the border, even if the owner is family. Border officers may also have quotas for more thorough examinations. I remember a lawyer on radio saying that they take "naked" laptops across the border. Most definitely DO NOT cross ANY border with anything that in the most remote possibility would trigger the interest of customs. To sanitise a phone or tablet, fill it with dashcam video, encrypt and factory reset. Then set it up with a fresh Google or Apple ID. Maybe leave your sim card at home. Having repartitioned a tablet, I discovered that there is a massive amount of hardware data in partitions that most people are totally unaware of.