Whether the prosecutor's order joining the two criminal investigations was lawful.
The joinder was lawful because the two investigations concerned the same offender and the principle of procedural unity applied; A.________'s arguments attacked the merits rather than the joinder decision.
An order joining or severing criminal proceedings is immediately appealable. Under Arts. 29 and 30 CPP, joinder is appropriate where objective reasons justify it and where procedural unity avoids contradictory judgments and promotes efficiency. The appealed cases were connected and concerned the same person, so the order was not arbitrary.