You are referring to the 4th Amendment to the Constituion, but it does not spell out how warransts are issued, only that warrants are necessary.
Arrest warrants can be issued by any judicial officer having jurisdiction. (e.g.: Justice of the Peace - Magistrate - Judge).
Can be but they have to be signed by a judge
M.S. Brahm Bhatt, issued the warrants without even examining the complainant.
Warrants don't expire because they are issued by the court and only the court can cancel them.
Warrants are only issued if a judge feels there is just cause to search someone or some place. If the evidence isn't there, a warrant may not be issued.
In the state of Oregon, there is no statute of limitations on bench warrants. Bench warrants remain valid until the person it is issued for is arrested.
In the case of federal warrants being issued or not issued - it is not 'evidence' that matters it is PROBABLE CAUSE that must convince the Federal Juege or Magistrate to issue one or not, the same as in local or state warrants.
There are two kinds of arrest warrants: "straight" warrants, which are issued as a result of a criminal complaint or indictment, and "default" warrants, which are issued because a person defaults on their responsibility to either appear in court or pay a court-mandated fine. From http://www.mass.gov/legis/senate/warrant.htm
Warrants are ISSUED by a judge or by the police
fourth
Warrants may be cancelled by petitioning the court that issued the warrant.
Warrants never expire. They exist until canceled by the judge.