Dairyground, HD is of course technically correct but he is becoming a little repetitive about it. The reality of course is that scanners have been used frequently by enthusiasts since I was a little kid and I have NEVER observed the law being enforced by either the police or anyone else. However, in these modern times, unless spotters/enthusiasts refrain from the urge of immediately posting on social media what they hear, this could well change in the future!