Yes they are.
Brussels National Airport, March 1998. I watch planes on a nice sunny Sunday afternoon when a police car drives by.
"Hey you! Come here" the airport police officer yelled from his car.
"Is that a scanner?" he asked.
I said it was a radio.
"Do you know that it is prohibited?" he asked.
I said I didn't know and that I was not going to do this again.
When the police took it away from me at the airport, I explained them that I was using this just for my own pleasure, they said it was forbidden anyway. I said I got my pilot's licence in the United States and did not know that using a scanner was not allowed. That was March. Two months later I get a letter from the police: "Mr Ben Soriano, you are required to come to the police station next Monday". So I go to the police station, the officer takes me to his office and tells me: "Do you want to give your radio up?" I said I din't want to. "What for?" he replied. Then I explained I was interested in aviation, showed him my pilot's license, and I said I enjoyed listening to pilot's conversation. He said I could get a fine but did not know how much.
Last month, just after I come back from a trip to New York, I get another letter from the police: "Mr Ben Soriano, please come to the police station next Monday". I go there again, the same officer greets me. I tell him: "I think we met already". "Yes we have" he said. He then told me that I had no choice but giving up my radio, that it was totally forbidden, otherwise I could get into more trouble. I said "OK fine. I don't want it anymore"
I signed the paper, then he said everything was in order. He let me go, that was the end of it. After going twice to the police station within eight months, I still didn't get any fine.
Well, I did the right thing. I'd rather loose my scanner than get into further trouble.
So I advice you strongly this: If you go to a foreign country, don't ever bring your scanner.
I hope that my story will be a good lesson for you.