President Duterte to take drastic measures fight against crime under the new Republic Act No. 10973. The PNP Department "Criminal Investigation and Detection Group (CIDG) get now express power under the new Republic Act to hand over an SUBPOENA (Vorladung unter Strafandrohung) in the case of attempt to commit a crime of surrender of property. In other words, the CIDG can execute a search warrant.
Important notes for Foreign - in default of appearance (contempt of court) the Government will be to issue an arrest warrant ! Résumé - It's all to recommend to act under the Philippine Law.