The requirements are:
(1) the warrant must be issued upon probable cause;
(2) the probable cause must be determined by the judge himself and not by the applicant or any other person;
(3) in the determination of probable cause, the judge must examine, under oath or affirmation, the complainant and such witnesses as the latter may produce; and
(4) the warrant issued must particularly describe the place to be searched and persons or things to be seized.
**Outlined from Read Frank Uy Unifish Packing Corp. vs Bureau of Internal Revenue