Just to clarify, in order to arrest someone, you need probable cause that a crime was committed. LE can draft a probable cause affidavit and go to a judge who signs off on an arrest warrant. That was issued here and subsequently sealed. The DA then filed 3 charges which are listed on the public docket. It doesn’t look like there was a grand jury. Rather, the DA just filed the charges. Once he is arraigned his attorney can challenge whatever was filed (depending on the state law and local practice) but usually the cases move forward either to plea negotiations or to trial.