CARTER, Justice.

Pursuant to our prior grant of discretionary review, defendant, Anthony Jamison, challenges an order denying his motion to suppress evidence in a pending criminal prosecution. The issues on appeal are: (1) whether the warrant on which police officers relied in searching defendant's automobile was issued on a showing of probable cause; and (2) whether, if probable cause was lacking, the evidence is nevertheless admissible because the warrant was obtained and executed in good faith. We answer both questions in the negative and reverse the order of the district court.

Sometime prior to September 1, 1990, Davenport police officers received information from a confidential informant that one Terry Rodriguez was trafficking in controlled substances. A determination was made to place his residence under surveillance. This surveillance commenced four days before the issuance of the search warrant challenged on this appeal. Less than forty-eight hours before the issuance of the challenged warrant, a police informant successfully purchased cocaine at the Rodriguez residence as part of a controlled buy.

Within forty-eight hours after the controlled buy, a Davenport police detective prepared an application for a search warrant, which was presented to a district associate judge. The warrant application contained three sworn assertions by a Davenport police detective: (1) that Rodriguez had been arrested on November 13, 1988, and charged with possession with intent to deliver cocaine; (2) that Rodriguez was observed on December 20, 1988, associating with well-known drug dealers; and (3) a recitation of the facts surrounding the controlled buy, which had recently taken place at the Rodriguez residence.

The district associate judge approved the warrant application and issued the warrant at approximately 7:30 p.m. on September 5, 1990. Almost immediately thereafter the officers conducting surveillance at the Rodriguez residence were notified by telephone and radio communication that the warrant had been issued.

In issuing the warrant, the district associate judge placed the following handwritten statement above his signature: "Surveillance and controlled buy insures credibility of buy." The warrant authorized the police to search:

The residence of Terry Rodriquez at 2624 Fair St. in Davenport, Iowa. Including Rodriquez himself and a 1976 Chevrolet coupe with Ill plates KC 3973 also any other vehicles owned by or in the control of Rodriquez at the time of execution of the search warrant. Any out buildings and storage areas under the control of the occupants of the residence and the person and vehicles of any other subjects at the residence after the signing of the search warrant.

(Emphasis added.)

The officers conducting surveillance at the Rodriguez residence maintained a log of vehicles stopping at the house after the warrant was issued. Defendant's automobile, a red Mazda RX7, was the second automobile to arrive. It arrived exactly one hour following the issuance of the search warrant. The driver entered the house and left seven minutes later. A police detective was dispatched to follow, stop, and search that vehicle. With the help of a uniformed police officer, he did so. The stop was accomplished a few blocks from the Rodriguez house so that the occupants would not be apprised.

Defendant, the driver of the red Mazda, stopped after being alerted by the officers' flashing lights and siren. As the officers approached, he placed something on the car floor. After defendant was ordered from the car, the officers found a specially folded paper wrapper cut from a travel magazine on the seat of the car and a white powdery substance on the vehicle's floorboard. The white substance was later determined to be cocaine. The paper wrapper matched a scissored travel magazine later found at the Rodriguez residence.

Defendant was arrested and later charged with possession of a schedule II controlled substance. Later that evening, the search warrant was executed at the Rodriguez residence, where police found and seized a glass containing a white powdery substance that tested positive for cocaine, a sifter, and packaging materials.

Defendant moved to suppress all evidence obtained from the seizure and search of his automobile and any statements obtained from him by police after his automobile was stopped. This motion was predicated on fourth amendment grounds. It asserted that defendant's vehicle was stopped and searched in the execution of a warrant that was issued without probable cause to search his automobile. The motion to suppress also asserted that any statements made to police officers by defendant after the stopping of his vehicle, either before or after he was placed under arrest, were derivative of the illegal seizure and search of his automobile.

The district court denied the motion to suppress. In support of that ruling, the court stated its belief that the court of appeals, in State v. Ballew, 456 N.W.2d 230 (Iowa App. 1990), had upheld a vehicle search against a fourth amendment challenge under similar circumstances. We review that ruling on this appeal.

I. The Probable Cause Issue.

Defendant argues that no showing was made in the warrant application and no facts existed at the time the warrant was issued to provide probable cause under the fourth amendment for the seizure and search of his automobile. He further contends that the court of appeals decision in Ballew in no way authorizes the search that he is challenging in the present case.

The State in its response makes a convincing argument for probable cause to search the Rodriguez residence. It suggests no facts, however, either in the warrant application or dehors the warrant application that would show that at the time the warrant issued there was some nexus between the defendant or his vehicle and the criminal activity being carried on at the Rodriguez residence. To defeat the motion to suppress, the State must show a nexus between criminal activity, the things to be seized, and the place to be searched. State v. Seager, 341 N.W.2d 420, 427 (Iowa 1983).

If a warrant calls for the search of multiple places or persons, probable cause must exist as to each location or person sought to be searched under authority of the warrant. This requirement has been described by one commentator in the following terms:

[W]here the warrant authorizes seizure of objects W, X and Y but the probable cause showing in the affidavit is only as to objects W and X, or where the warrant authorizes seizure of all objects of Z variety but the probable cause showing only covers some such objects . . . the problem is essentially a deficiency in probable cause showing vis-à-vis certain of the described items. Such a case, then, is analytically most similar to that in which it turns out the warrant is lacking in any probable cause showing, and ought to be resolved in the same way.

1 W. LaFave, Search and Seizure: A Treatise on the Fourth Amendment § 1.3(f), at 68-69 (1987) [hereinafter W. LaFave].

In another volume of his treatise, this commentator categorically condemns the type of dragnet warrant that defendant challenges in the present case:

Sometimes a warrant will be issued for the search of certain premises and "all automobiles thereon." Such a warrant, it would seem, is particularly vulnerable to challenge with respect to the vehicle description. As with any other description based solely on location, there can be no assurance that the vehicle or vehicles as to which information was gathered during an earlier investigation will be the vehicles found on the premises at the time of the search. The risk of error is compounded when the plural "all automobiles" is used. Moreover, such a description suggests that there is likely to be a probable cause deficiency as to the automobiles; the "all automobiles" language might well have been added without any evidence tending to show that vehicles on the premises were likely places of concealment for the items to be seized.

2 W. LaFave § 4.5(d), at 225 (1987).

Although the State contends that the suppression of evidence issue raised in the present case was decided favorably to the State in Ballew on similar facts, a reading of that case does not support this contention. The court of appeals specifically answered the probable cause argument in that case by reference to facts in the warrant application indicating the presence of defendant's automobile on the targeted premises, where drugs were located, prior to the issuance of the warrant.

The court of appeals also observed in Ballew that surveillance in that case indicated that the defendant was one of the regular occupants of the targeted premises. Ballew, 456 N.W.2d at 232. In addition, both of the cases cited by the court of appeals in upholding the search involved situations in which a particularized showing was made in the warrant application tying the automobiles and persons to be searched to criminal activity at that location.

In addition, the Ballew analysis also involved a claim of investigatory stop under the authority of Terry v. Ohio, 392 U.S. 1, 88 S.Ct. 1868, 20 L.Ed.2d 889 (1968). The State has made no effort in either the district court or in this court to assert that the stop of defendant's automobile was sustainable as an investigatory stop as a result of his entry and exit of the targeted premises where drugs were being sold. Moreover, the officers who stopped defendant's automobile testified at the suppression hearing that they were acting under authority of the search warrant that had been issued. We have consistently held that in determining the validity of an investigatory stop police officers are bound by the real reasons for their actions. The stop may not be upheld based on reasons that might have existed but in fact did not. State v. Lamp, 322 N.W.2d 48, 51 (Iowa 1982); State v. Aschenbrenner, 289 N.W.2d 618, 619 (Iowa 1980); State v. Cooley, 229 N.W.2d 755, 757-59 (Iowa 1975). This is particularly true when the validity of an investigatory stop depends on an officer's exercise of judgment that in fact was never made. State v. Bailey, 452 N.W.2d 181, 183 (Iowa 1990).

In contrast to Ballew, there was no showing in the warrant application in the present case of any nexus between defendant or his automobile and the existence of criminal activity at the targeted premises. Several of the officers who took part in the application for the search warrant and the execution of the warrant testified at the suppression hearing. Their testimony shows that prior to the execution of the warrant neither defendant nor his automobile had been seen at the targeted location. The officers had no knowledge of any relationship between defendant and Rodriguez other than the fact that defendant had at one time been Rodriguez's lawyer.

Based on our review of the warrant application and the additional record made at the suppression hearing, we find a complete absence of probable cause for a warrant authorizing the search of defendant's person or his automobile. The district court erred in finding the presence of probable cause.

II. The Leon Issue.

We next consider the State's effort to avoid suppression of the fruits of the illegal search on the strength of United States v. Leon, 468 U.S. 897, 104 S.Ct. 3405, 82 L.Ed.2d 677 (1984).

In measuring the scope of the exclusionary rule to be ascribed to federal fourth amendment violations, federal law is controlling. Because the Supreme Court in Leon has recognized a so-called good-faith exception to the exclusionary rule, so must we in making this federal law determination. As we have previously recognized, however, Leon does not provide an across-the-board reward for good faith. State v. Iowa Dist. Court, 472 N.W.2d 621, 624-25 (Iowa 1991).

Under the Leon rule, the exclusion of illegally obtained evidence is to be refused only on an ad hoc basis in situations in which the officer's good-faith motivation casts doubt on the deterrent effect of an exclusionary rule in the particular situation. Conversely, as Leon expressly recognized, the exclusionary rule should continue to operate in "those areas where its remedial objectives are thought most efficaciously served." Leon, 468 U.S. at 908, 104 S.Ct. at 3412-13, 82 L.Ed.2d at 689.

One commentator has interpreted Leon as follows:

This reference [in Leon] to a "case-by-case" approach, taken together with the other passages quoted, supports the conclusion that the Court meant to fashion a sliding scale of remedies to be applied in accordance with the nature of the violation of the right. The Court also appears to have decided that though it could take judicial notice that exclusion is not necessary to deter certain violations, other situations may emerge "case-by-case" that will also require the use of the exclusionary rule to effectuate fourth amendment rights.

Goldstein, The Search Warrant, the Magistrate, and Judicial Review, 62 N.Y.U.L.Rev. 1173, 1204-05 (1987).

In the present situation, involving a dragnet search warrant, the deterrent aspects of the exclusionary rule are well served by exclusion of the challenged evidence. This is because a refusal to exclude the evidence will certainly have the effect of encouraging similar dragnet search warrants in the future. It is not necessary, however, to go beyond the examples contained in Leon itself to justify exclusion of the evidence.

The Court in Leon identified certain situations in which exclusion is still warranted. One such situation deals with warrants that are so overbroad as to be facially invalid. See Leon, 468 U.S. at 923, 104 S.Ct. at 3421, 82 L.Ed.2d at 699. To the extent that the warrant in the present case authorized the search of "the person and vehicles of any other subjects at the residence after the signing of the search warrant," we believe it was facially deficient with respect to overbreadth.

Another situation identified in Leon where exclusion is warranted involves a warrant application "so lacking in indicia of probable cause as to render official belief in its existence entirely unreasonable." Id. As indicated in the prior division of this opinion, the indicia of probable cause in the present case must be considered with respect to defendant's automobile rather than the Rodriguez residence. The quantum of evidence offered in the search warrant application to show a nexus between criminal activity or evidence of crime and defendant's automobile or person was zero.

In State v. Iowa District Court, 472 N.W.2d at 624-25, we found Leon to be inapplicable because of facial invalidity of the warrant and also because the magistrate's probable cause finding was not objectively reasonable. Id. The lack of objective reasonableness appears to be even greater in this case. See also United States v. Hove, 848 F.2d 137, 140 (9th Cir. 1988) (information providing nexus to place to be searched was so deficient that any official belief in the existence of probable cause must be considered unreasonable); Nelms v. State, 568 So.2d 384, 388 (Ala. App. 1990) (staleness of events tending to establish probable cause rendered belief of probable cause unreasonable).

After considering all arguments presented, we conclude that the district court should have sustained the motion to suppress evidence derived from the seizure and search of defendant's automobile and evidence derivative therefrom. Such derivative evidence includes statements made by defendant after his vehicle was stopped, both before and after he was placed under arrest. We reverse the order of the district court and remand the case for further proceedings not inconsistent with this opinion.

REVERSED AND REMANDED.

All Justices concur except HARRIS, J., and McGIVERIN, C.J., and LARSON and SCHULTZ, JJ., who dissent.