It depends on where they are and what you do with the photos. If they are in public and you don't use the photos for commercial purpose, it is legal. However, there are issues if the person is in their home and you are "peeping" or if you intend to use the photos commercially.
It depends on what is happening, mostly.
If it is only for their own private motives, (Whichever they may be), it is not illegal, unless you do not consent to it. If they upload a photograph of you without your permission, it definately is illegal regardless of how innocent the photograph is.
Yes, but they can't use it without your permission.
Depends on your country and what the person taking the photographs intend to do with them, but generally no, its not illegal.
not really because it might show up on facebook or somewhere else without the purson knowing and you could go to jail.
No. Posting a picture of someone without their permission is illegal.
They can not print this picture without permission.
yes it is illegal to post the picture of any person without their permission
Yes, it is illegal anywhere in the U.S to do that!
Yes it is
If it is without their permission; yes it is illegal.
They could but it is illegal without your permission.
Without permission-yes.
An illegal immigrant is someone who, without permission, enters a country to live and work.
No, I think it's illegal .
No. However, if they are on your property without permission when they take the picture, that could be considered trespassing.
yes