Wanted to add to the above post. If it were law on a public street. TV News commentators would have to get consent forms from every pedestrian passing by making a noise.

Just make sure you are on the street, not private property.

This is great, thanks.
Shame we can't do it in the UK, all of the police frequencies are encrypted. You can only access them with a chipped radio that has been authorised by headquarters

Great info for emergencies.
I'm currently listen to police reporting a tornado touchdown in Indiana.
I'm using the police scanner radio pro for ipad app.

dude that is sooooo cool!! Thank you for that link!