Donald Wayne Batbin, defendant, in a two count indictment was charged with importing and possession with intent to distribute marijuana in violation of 21 U.S.C. §§ 841(a)(1) and 952(a). Barbin filed a motion to suppress evidence from an alleged warrantless search and seizure of a motor vehicle and the sailboat it was towing which contained about 435 pounds of marijuana. After an evidentiary hearing, the district court denied the motion. Barbin thereafter pleaded guilty to the possession count. The importing count was dismissed on the government’s recommendation. Barbin’s plea was made pursuant to a plea bargain in which he reserved the right to appeal and challenge the district court’s denial of the motion to suppress. Fed.R. Crim.P. 11(a)(2). Should he be successful on this appeal, he would then have the right to withdraw his plea. Id. Barbin has filed a timely notice of appeal contending that the search and seizure in question was unreasonable and in violation of the Fourth Amendment of the United States Constitution. After a review of the record, we conclude that the district court correctly disposed of Barbin’s motion to suppress and that his conviction should be affirmed.
*258 A. Suppression Hearing
The following evidence was introduced at the suppression hearing. A United States Customs Patrol Officer testified that on December 5, 1983, at approximately 6:00 p.m., in a telephone call, he “received information from a previously reliable informant that a load of marijuana was to be smuggled into the United States at the Rio Grande River, mouth of the river.” The officer testified that the specific information was that “a brown Jeep Cherokee was towing a trailer with a yellow sailboat on it, approximately 18 feet long.” The driver of the motor vehicle was also described with specificity — as “a tall anglo male, wearing thick glasses, and [a] big, thick mustache.” The marijuana, about 450 pounds, was said to be concealed in the hull of the sailboat. The vehicle and sailboat were said to be in the Matamoros, Tamaulipas, area of Mexico. Although the officer did not know from where the informant was calling, or how he had obtained his information, he thought that the informant generally was in Matamoros. The next morning at approximately 8:30 a.m., the officer received additional information in another telephone call from the informant that the vehicle and sailboat had reached the mouth of the river on the Mexican side of the border and a crossing of the border was to be made at this point. The officer had previously paid the informant for information and had used him about 15 times. Some of the information he received had proved incorrect, but about 10 or 12 arrests and convictions had resulted from the informant’s information.
Two other customs officers, notified of the information received, were immediately dispatched to the mouth of the river area. They observed a brown Jeep Cherokee towing a boat traveling west on Highway 4 about 1 mile east of its intersection with Farm Road 1419. Highway 4 is a paved roadway that leads in an easterly direction from Brownsville, Texas, to a beach close to the mouth of the Rio Grande. To the north Highway 4 is bordered by the Port of Brownsville Ship Channel; to the south it is bordered by the twisting bends of the Rio Grande River. Traveling west on Highway 4 from the beach area, Farm Road 1419 is the first paved road encountered that extends in a north-south direction to the river. A stop of the vehicle and sailboat was made shortly thereafter, about 25 miles from the border. The vehicle, sailboat and Barbin, who was driving the vehicle, matched the description given by the informant. After the sailboat was taken to the gateway bridge and subjected to a dog sniffing test which was positive, the officers broke into the left side well and found the marijuana. The trailer and sailboat had sand on their undersides and the trailer tongue had “river type mud” on it. The sailboat also displayed where it had recently been repaired and freshly repainted in the area of the well. The sailboat also had the appearance of not having been used in a long time, contrary to Barbin’s statement that it had been used the day before. A later investigation by officers at the mouth of the Rio Grande River disclosed tire tracks which matched the tires on the vehicle and “where a tongue of a trailer had been drugged [sic] across.” The officers concluded that the sailboat and trailer were floated across the river at this point. The officers testified that they did not obtain a search warrant because they were conducting a customs border search.
B. Warrantless Searches and Seizures
“In general, warrantless searches and seizures are unreasonable under the fourth amendment except those falling within a few narrowly defined exceptions.”
United States v. Niver,
*259 (1) Automobile Exception
(a) Probable cause to search
“[P]olice officers who have legitimately-stopped an automobile and who have probable cause to believe that contraband is concealed somewhere within it may conduct a warrantless search of the automobile that is as thorough as a magistrate could authorize by warrant.”
United States v. Mendoza, 722
F.2d 96, 100 (5th Cir.1983) (citing
United States v. Ross,
The probable cause necessary for a warrantless search is to be determined by the same standard as that for issuance of a warrant.
United States v. Mendoza, 722
F.2d at 100 n. 5;
United States v. Cisneros-Mireles,
“to be evaluated in the light of the ‘totality of the circumstances.’ ‘The task of the issuing magistrate is simply to make a practical commonsense decision whether, given all the circumstances set forth in the affidavit ..., including the ‘veracity’ and ‘basis of knowledge’ of persons supplying hearsay information, there is a fair probability that contraband ... will be found in a particular place____’”
United States v. Phillips, 727
F.2d 392, 395 (5th Cir.1984), (quoting
Illinois v. Gates,
In the present case, absolutely no indication of the basis of the informant’s knowledge was given to the authorities. However, the customs officer contacted had previously relied on information from the informant in question about fifteen times resulting in several arrests and convictions. This Court has recognized the continuing applicability of the
Aguilar-Spinelli
precedents
1
in considering the basis of knowledge or the veracity aspect of a probable cause determination.
United States v. Phillips,
Barbin argues that even if the search of the automobile was not unreasonable, searching the sailboat was unreasonable since it was neither a container nor an extension of a motor vehicle. The specific
*260
holding in
Ross
was that police officers, having probable cause to believe a vehicle contains contraband, “may conduct a search of the vehicle that is as thorough as a magistrate could authorize in a warrant ‘particularly describing the place to be searched.’ ”
(b) Exigent circumstances
It remains necessary, nevertheless, to justify conducting the search without a warrant. Barbin points out that not even a telephonic warrant was requested despite the availability of a magistrate familiar with the procedures for telephonic warrants pursuant to Fed.R.Crim.P. 41(c). “The legislative history reflects that an important purpose for the rule was to encourage law enforcement personnel to obtain warrants.”
United States v. Berick,
However,
Ross
makes no reference to telephonic warrants nor have any cases been found following
Ross
that involve telephonic warrants. An en banc decision by this Court preceding
Ross
noted that exigent circumstances may render a warrantless automobile seizure and search constitutional.
See United States v. Mitchell,
(2) Border Search Exception
“[T]he warrantless search at the international border ... is justified on the basis of the sovereign’s historical right to protect itself by examining people and property entering the country ____ Not only may government officials search prop
*261
erty at the border without a warrant, but they need not have any suspicion to justify their search.”
United States v. Niver,
[Wjhatever type of search is involved, a border crossing must be demonstrated by more than reasonable suspicion or probable cause. We have generally required a showing beyond a “reasonable certainty” that the entity searched has crossed the international border, ... or “a high degree of probability that a border crossing took place.” ... The standard of “reasonable certainty” has been described ... as something more than probable cause, but less than beyond a reasonable doubt.
Id. at 526. (citations omitted).
Barbin contends that the government failed to prove that a border crossing had occurred. The facts in this regard are summarized as follows: the vehicle and sailboat were reported by an informant to be approaching the border on the Mexican side at the mouth of the Rio Grande River and a crossing was to be made at this point; they were later sighted within 25 miles of the border on the United States side; the trailer and boat had sand and river mud on them; tire and trailer tracks were found at the border river crossing matching the vehicle and trailer. From this circumstantial evidence, the district court was justified in concluding that the border had been crossed by the sailboat and trailer.
In addition to showing that a border crossing has occurred, necessary for any border search, to justify a warrantless “extended border” search,
[t]he government must also be able to show, with reasonable certainty, that conditions remained unchanged from the time of the border crossing until the subsequent warrantless search____ In other words, it must be established with reasonable certainty that, when searched, the person or thing was in the same condition as when the border was crossed. This requirement is usually met by proving either that the object searched was subject to constant surveillance from the time it crossed the border or that, under the circumstances, the contraband was not likely to have been introduced during any breaks in the surveillance.
United States v. Richards,
*262
The final requirement for a valid war-rantless extended border search is that “the government agents must possess a reasonable suspicion, supported by articula-ble facts, that the person or thing searched is involved in illegal activity, such as smuggling contraband.”
United States v. Richards,
AFFIRMED.
Notes
.
Spinelli v. United States,
