Most search warrants are issued only after probable cause already exists that evidence of a crime will be found at a particular location. An anticipatory search warrant is different. It allows a judge to authorize a future search when probable cause does not yet exist at the location to be searched, but there is probable cause to believe it will exist once a specific event occurs.

The most common example is a controlled delivery of contraband. Law enforcement may know that illegal drugs or other evidence are on their way to a residence, but the items have not yet arrived. Rather than waiting until after delivery to seek a warrant, officers can ask a court to approve a warrant in advance. The warrant becomes valid only if a clearly defined triggering event occurs, such as the successful delivery of the package.

Courts have long recognized anticipatory warrants as constitutional when they are carefully drafted. In U.S. v. Grubbs (2006), the U.S. Supreme Court confirmed that anticipatory warrants are constitutional when there is probable cause to believe that the triggering condition will occur and that evidence will be found at the location once the condition occurs. In U.S. v. Ricciardelli (1993), the First Circuit Court of Appeals explained that the triggering event must be clearly defined and leave officers with little discretion in deciding when to execute the warrant.

Two Basic Requirements for an Anticipatory Warrant:

1. A Clear Triggering Event: The warrant must identify a specific event that must occur before the search can take place. The event must be objective, easily determinable, and sufficiently narrow to prevent officers from deciding for themselves whether the warrant should be executed.
2. A Reliable Connection to the Place to Be Searched: The supporting affidavit must establish that the contraband or evidence is on a reliable course toward the location to be searched. The warrant must make clear that execution is contingent upon the evidence actually arriving.

In U.S. v. Gendron (1994), the First Circuit upheld an anticipatory warrant because the warrant specifically stated that it could be executed only after the intended recipient received the item through the mail. The case demonstrates the importance of clearly stating the triggering condition in the warrant itself.

When Are Anticipatory Warrants Used?

Anticipatory warrants are most often used during controlled deliveries.

• Investigators learn that drugs or other contraband are about to be delivered to a residence.
• Officers intercept a suspicious package and confirm that it contains contraband.
• Law enforcement plans a controlled delivery to the intended destination.
• Officers seek advance judicial approval to search the location once delivery occurs.

The affidavit should explain not only why officers believe the delivery will occur, but also why the information is reliable and what role law enforcement will play in creating or monitoring the triggering event.

Controlled Delivery Investigations

When officers intercept a suspicious package, the investigation often unfolds in several stages:

1. Develop probable cause that the package contains contraband.
2. Obtain legal authority to search the package if required.
3. Confirm the presence of contraband.
4. Reseal the package.
5. Conduct a controlled delivery.
6. Execute the anticipatory warrant if the triggering condition occurs.

The affidavit should carefully describe each step so the court can evaluate the reliability of the planned delivery and the adequacy of the triggering condition.

Postal Investigations

Important: If the investigation involves United States mail, federal law and postal regulations may require the involvement of the United States Postal Inspection Service and the use of federal search warrant procedures. Officers should contact Postal Inspectors whenever an investigation requires the interception, opening, or delivery of mail that remains in postal custody.

Practical Considerations

After officers confirm the presence of contraband and reseal the package, they may proceed with the controlled delivery. However, the anticipatory warrant can be executed only if the triggering event actually occurs.

The affidavit and warrant should complement each other:

• The affidavit should explain why delivery is expected and why officers believe the triggering event will occur.
• The warrant should clearly state the event that must occur before officers are authorized to enter and search.

Drug Deliveries

In drug investigations, officers may often remove a substantial portion of the drugs before conducting a controlled delivery. This reduces the risk that all of the evidence will be destroyed before officers can recover it.

Investigators also frequently place an electronic monitoring device inside the package. A transmitter can alert officers when the package is opened, helping establish that the recipient exercised control over the contents. This can be important because some controlled deliveries fail to result in prosecution when the package is never opened or is accepted by someone other than the intended recipient.

Why Anticipatory Warrants Require Careful Drafting

Although anticipatory warrants are relatively uncommon, they are an important investigative tool in the right circumstances. Because execution depends on a future event, these warrants often generate legal challenges concerning timing, delivery, and whether the triggering condition actually occurred. For that reason, anticipatory warrants are very useful when a traditional warrant is impractical and when the triggering event can be defined with exceptional clarity. Careful drafting of both the affidavit and the warrant is essential to ensure that the search will withstand later judicial scrutiny. It is important to involve a prosecutor in drafting the affidavit and to state that involvement in the affidavit.

Example 1: Controlled Drug Delivery

Officers intercept a package containing illegal drugs that is addressed to a residence.

• Investigators confirm the contents of the package.
• Officers obtain an anticipatory search warrant.
• The warrant states that it may be executed only after the package is delivered and accepted at the residence.
• An undercover officer or delivery service completes the delivery.
• Once the package is taken inside and the triggering condition is satisfied, officers execute the warrant.

Example 2: Shipment of Stolen Property

Police receive reliable information that stolen electronics are being shipped to an apartment.

• Officers obtain an anticipatory warrant authorizing a search only after the shipment arrives.
• The warrant becomes effective once the delivery is completed.

Example 3: Other Contraband Deliveries

Investigators intercept contraband in transit via a commercial carrier.

• Officers confirm the nature of the items.
• A controlled delivery is arranged.
• The anticipatory warrant authorizes a search only after the delivery has occurred and the triggering condition is met.