I disagree. That is too general of a statement when there are very specific laws depending on what state you are in. All it does is add to the misinformation .. to quote verbatum from the website that I posted above (hint-hint):
If scanners are known to be either illegal or restricted in any states they will be listed below, with links to the text of the law, if known. If a state is NOT listed below, there is NO known scanner law.