Most searches conducted with a search warrant are valid. There are, however, instances in which a search even though conducted with a warrant may be unconstitutional. The most effective way to challenge the legality of a search warrant is to question the truth of the underlying facts contained in the affidavit submitted by the law enforcement officer who requested the warrant. Some searches may also be deemed unconstitutional because law enforcement did not follow the terms of the warrant. This may include failure to search the correct location, failure to search at the correct date or time, or the search was beyond the scope permissible by the warrant. Challenging the validity of search warrant is a very technical and you should contact an experienced criminal defense attorney to review the facts of your case and determine if the warrant search was legal.