Most judges do an excellent job evaluating the probable cause within the document. If a judge takes issue with something in the warrant, it is usually corrected and represented at a later time. Prosecutors and law enforcement officials have the duty to honestly disclose the facts to the judge. However, judges, prosecutors and law enforcement officials are people, and sometimes make mistakes.
Common mistakes are:
Incorrect description of the location to be searched;
Police took items not described in the warrant;
Prosecutor or law enforcement officer left out key details;
Judge was tired and accidentally signed a warrant that did not have probable cause.