We dont know what evidence they have but from what they are saying it suggest they have some.
The police have said they don't want to question Bruickner yet until they have finished their preliminary investigations. The reason being that if they question him they have to release to his team everything they have. I would say that suggests they have some information/evidence they do not wish him to see. i wonder what that is.
No, I think you only get to see the evidence when charges are being prepared (stage 2). They can question him and he can remain silent, they can still go on gathering evidence to try and charge him ( which is what they must be doing) Stage 1
''If the investigation reveals sufficient grounds for you to be charged, the public prosecutor will submit an indictment setting out the charge'
Will I be informed of the witnesses and evidence against me?
In the indictment, the public prosecutor will list the evidence in support of the charge. Your defence lawyer will be able to view the file no later than at the end of the investigation and before the charge is brought against you. ''
Of course we don't know what evidence they have but it isn't enough to charge him and it can't be that compelling
because to bring charges they need to have a 'reasonable expectation' the person would be convicted. So as it stands they cannot have an expectation the evidence they hold could convict him....ie. it's not compelling.
This is what Judge Thomas Fischer said too. They haven't charged, so it can't be compelling evidence.
'"If the public prosecutor knew more, they would say more."
Dr Fischer went on to say he was skeptical the case was about to be solved and unconvinced the police have enough evidence to prosecute.
"There is a clear evidence base, but no compelling evidence,” he said.''
https://www.swr.de/swr2/leben-und-gesellschaft/podcast-sprechen-wir-ueber-mord-100.html