A search warrant is valid only if the information on it is fresh. If the time lapse is such that the items could have been moved to another location, the search warrant is stale and considered expired. Any evidence found in execution of a stale warrant is inadmissible. State laws also control how and when a search warrant can be executed. Usually, this is accomplished by a form on the back of a warrant copy, which is also left at the scene with the names of all officers participating in the search and seizure.
Laws governing bench warrants vary widely.
Most states have passed laws emulating these federal standards, but some states are more restrictive. At the state level, usually the Attorney General must approve of such techniques. Generally, such warrants are only good for 30 days, with renewal available on the basis of probably cause. Transcripts of what the surveillance recorded is returned to the court, much like the return on a search warrant. A Tactical Guide to High Risk Warrant Service .