Do you need to provide a person's blood type to the magistrate to secure an arrest warrant?

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Arrest warrants are issued when there’s probable cause and enough information to identify the person who committed the alleged crime. A blood type doesn’t help establish probable cause, nor is it a practical or reliable way to identify someone in the field. It’s medical information that isn’t routinely needed for a warrant and would require separate authorization to release. Therefore, you do not need to provide a person’s blood type to a magistrate to obtain an arrest warrant. If such information were ever sought, it would be handled only through a proper, separate legal process.