Dangerous to enter US with a Laptop
AS long as they do not use invasive techniques such as strip searches, the US Customs does not need reasonable suspicion or probable cause to seize what they want - including laptops. A survey last month by the Association of Corporate Travel Executives found that nearly half of the participating companies did not know customs agents could inspect, copy, or even seize travellers' laptops.
You shouldn't take anything across the border that you don't want to expose to another set of eyes.