Everyone can pray whenever they want...
I pray several times a day, wherever i am it doesn't matter because i pray in "silence". You don't have to bow your head or get on your knees to do this.
There are many kids in school that pray...many have been able to do the "Meet at the Flagpole" prayers and as far as i know nobody has ever stopped them.
I have heard alot about kids getting in trouble at school for praying though, and are told they can't bring Bibles to school. One young girl at a school near us was praying with another girl in the hallway because the other girl had some family problems. They were both taken to the principal and told if it happened again they would be kicked out. If it's between 2 or more people that WANT to pray and not interrupting or bothering anyone else, they should be allowed, it's their "right".
A few years ago at graduation in our town, the Valedictorian was told she could not say a prayer. So....at the end of her speech, almost ALL of the graduating class started reciting the Lords Prayer. Then almost ALL of the people in the bleachers said it right along with them! That was AWESOME! The looks on the administrations faces were priceless! Lol!
Now...That's what i'm talking about. Awesome!!! Way to go kids!.