Neb. Rev. Stat. § 29-3303

The order may issue upon a showing by affidavit of a peace officer that (1) there is probable cause to believe that an offense has been committed; (2) there is probable cause to believe that the person subject to the order has committed the offense; (3) procurement of evidence of identifying physical characteristics through nontestimonial identification procedures from an identified or particularly described individual may contribute to the identification of the individual who committed such offense; and (4) the identified or described individual has refused, or there is reason to believe he or she will refuse, to voluntarily provide the desired evidence of identifying physical characteristics. The contents of the affidavit may be supplemented or augmented by the affidavits of other persons or by sworn testimony given to the issuing judge or magistrate.