Yes, he does not need a "signed complaint" all he needs is a report of a crime and some investigation
to show that there is probable cause
that the person being sought in the arrest warrant is likely the party who committed that crime. Police get warrants all of the time for crimes they did not personally witness and merely received a report about without any "signed" statements. There is no requirement in the law about obtaining signed statements I am afraid, the only requirement is probable cause, which is reasonable articulable information that would lead a reasonable person to believe that it is more likely than not that the accused committed the criminal offense. Probable cause is all that is needed for an arrest, even though for a conviction the prosecutor must prove the defendant committed a crime beyond a reasonable doubt, which is a much higher standard than probable cause.
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