Because it seems that the longer the investigation takes, and the delay in meeting that initial threshold of charge, sometimes are the poison pills that result in the ability later to produce the evidence and get over all of those evidentiary hurdles and preserve the evidence.
Plus une enquête est longue, plus de temps s'écoule avant que les accusations soient portées, plus il est difficile, par la suite, de produire des preuves, de préserver les preuves et de surmonter tous les obstacles liés à la preuve.