Questão jurídica principal
Whether an appeal lies against the order opening an interdiction investigation and appointing an expert.
Decisão extraída
No. Such a decision is an evidentiary/instructional measure and is not subject to appeal; only an absolute nullity could be examined ex officio.
Fundamentação extraída
The challenged ruling concerns the opening of an inquiry and the commissioning of an expertise, which the court treats as measures of instruction. Under its case law, such measures are not appealable in non-contentious tutelary matters.