Key legal question
Whether anonymous witness testimony was admissible under the fair trial and confrontation guarantees.
Extracted holding
Anonymous witness protection was permissible in principle, but the testimony of witness x1 could not be used because the defence had no effective confrontation opportunity.
Extracted reasoning
Protecting a witness may be justified by safety interests, but the restriction on defence rights must be compensated as far as possible. Here x2 was effectively confronted through counsel, but x1 was never confronted, even indirectly, despite a valid request.