Thank you for all your comments
Sweden is not a very litigious country it not like America where lawyers rule. So we have less of a incentive to keep our asses clear.
But i wonder about these consent forms , considering traffic you might sniff might come from the outside and the person sitting at the other side hasn't signed a consent form and the attacker's "usually" come from the outside so you would like to sniff that traffic. Wouldn't the company need a big sign warning that we have a NIDS system like in Sweden you need to put up sign to be able to have surveillance cameras because their illegal if they havent. And as far as i know i have never seen such a sign. I know some people will say that we don't want the hacker to know we have one but i assume that most competent hacker guess that there there.