Is this search warrant valid as a result of the totality of circumstances?

Furthermore, the search was independently valid as a warrantless "extended border search" of the vehicle. The totality of circumstances, see United States v. Jacobson, 647 F.2d 990, 993 (9th Cir.), cert. denied, 454 U.S. 897 (1981), indicates that this was a legal extended border search because the government agents identified the vehicle as it passed the border in the morning and monitored it continually throughout the day, insuring that nothing had been loaded into the vehicle until the search that evening. This satisfies the rationale of Jacobson.