This is not sufficient. If you believe so, then it is you who lack an understanding of the law, not me.
No, it is sufficient by law. Maybe not in Norway, but in the UK and Italy I know as fact. If they
knew he was guilty he'd be arrested already. If the police believe
you may have incriminating evidence on your property - and that can come down to testimony - they need a reason and that is enough. I don't think you appreciate the enormity of this scandal, it is a very big issue. It's nothing to do with 'a hunch', Carobbio is a key suspect who is supposed to be 'outing' match-fixing allegations, so the police will treat it seriously.
In Norway, what happened in this case, would not stand. If you lived here, and I called the police and said "JuveJay has tons of weed, yo!", they couldn't raid your home when you weren't there. But they could start an investigation, and they could question you.
Call the police? No, that's just stupid. If someone who knew you was caught with a lot of weed on them and then under interrogation they said that they bought it from you and that you were growing it, then that is grounds for them to issue a search warrant. I've seen this happen for myself.
And yes, they do it whenever they want, unannounced. To not do that would be pointless, as I explained before.
Article 8 – Right to respect for private and family life
1. Everyone has the right to respect for his private and family life, his home and his correspondence.
2. There shall be no interference by a public authority with the exercise of this right except such as is in accordance with the law and is necessary in a democratic society in the interests of national security, public safety or the economic well-being of the country, for the prevention of disorder or crime, for the protection of health or morals, or for the protection of the rights and freedoms of others.
Which is what happens when
the court allows search warrants. This is what has happened, the prosecutors in Cremona have had their request for search warrants granted.