YES
You can video tape anything that you want. If they are dealing in a public place then they do not have any reasonable expectancy to privacy. If you can video tape something then you can post it to the web. You can also send it to the police.
No, not a real one.
Today most police cars have a video camera recording most of the time.
It is legal to videotape anyone anywhere, and a police officer is no exception.
It depends on what state you live in if it's legal to have a police scanner in your posession. You need to call your local police station and ask them the law.
police planing is planing
It is not legal for a President or police force to only enforce laws they choose. All laws that are legal on the books should be enforced by all government and police entities.
Yes, it's legal.
Yes, if police have taken someone into custody, they are in legal confinement between the point of arrest and the police station, where they will be booked for the offense for which they were arrested.
Cops
No, it is not legal to call 911 with a false police report. You could be arrested for doing that.
It is legal to play this song when being stopped by the police, but it's not very smart.