@DW,
I fully agree about France: BEA matches the role of AAIB/NTSB.
In Italy though, the investigating magistrate seems to sometimes need to impound wreckage and potentially disrupt the equivalent of BEA.
Of course, there's a step from having a vigorous ongoing judicial process to interfering with the dedicated crash investigation. And, the criminalization is subject to the choices of the magistrate in question.