The person is taken into custody by security personnel and turned over to the police who have jurisdiction. There are several charges that could apply from misdemeanors such as of creating a public nuisance/disturbance to felonies such as assault and/or battery (the player would not have to be injured for an assault charge to be valid. -----
As to where the ball would be placed, that would be upto the discretion of the officials. There have been instances in College Football history where players on the bench have tackled ball carriers that were running for touchdowns. The officials ruled those plays as touchdowns. The person would most likely also be crushed super hard by one or more players on the field before security could get there. Some people are just stupid like that.
In American Football one tackles a player. In Association Football (soccer) one tackles the ball.
Tosh-0 - 2009 Football Player Tackles His Teammate 2-4 was released on: USA: 3 February 2010
footballers were shin pads to protect their shins when a player slide tackles them
In flag football one pulls off the player with the ball's flag to tackle them. In tackle one physically tackles them.
Dhani Jones is a football player
The ball is placed where the ball actually is (assuming the player still has "possession") when the player is down by contact or when the knee hits the ground.
The player who tackles the player with the ball will be credited. If 2 people tackle the player with the ball at the same time they will each be credited with 1/2 a tackle.
When a defensive player tackles a quarterback behind the line of scrimmage as he is trying to throw the football .... that is called a sack.
Another football is brought out to continue gameplay.
For a turn over, tackles made by the offensive players are not recorded as a statistic.