Depending on the circumstances - "Aiding and abetting" or "Accomplice."
Morally, that is up for debate. But legally, it is not.
A person who witnesses a crime and does nothing to stop it or report it is under no obligation to do so. Therefore, though that action doesn't have a title, I would call it an unwillingness to get involved.
nothing much asbos.
No, but it should never be a crime to stop them.
It stops when you are arrested and charged.
A person who is involved either before, during, or after the act.
Nothing - there is nothing wrong with that. If anyone teases you or comments just laugh with them and ignore them - when they notice it doesn't bother you they will eventually stop and let you be.
They investigate a crime and stop it at the source.
Phone cops immediately and report the vandalism while the crime is still fresh and get pictures of the person who commit the crime and cops should witness the person doing the crime in process so the cop can arrest him as soon as possible.
I assume by checking you mean "not allowed by the person." Depends on which relation you got to the person. But mostly it is yes, since your compromising their security and personal data. Depending on your country, it is a crime and some places you can go to jail by this crime. I would suggest you to stop doing this. If you got the authorization of the person whom your checking for, it would not be a crime. = =
A do not resuscitate is decided by a person who believes or knows they are in poor health. If this person is to stop breathing, it is their wish that they be left to pass.
When you have knowledge of the offense and fail to report it. If you have knowledge of it after it occurred it is known as being "An Accessory After The Fact." If you know about the crime before it is committed you COULD be charged as a "principal" (i.e.- you know that it is about to occur -maybe even helped plan it- but do nothing/did nothing to stop it or report it).