here is pertinent section of rule book...thanks to middle tennessee assn for putting it out there
SECTION 2 THROW-IN PROVISIONS
A player shall not violate the following provisions governing the throw-in. The thrower shall not:
ART.1...Leave the designated throw-in spot until the ball has been released on a throw-in pass.
ART.2...Fail to pass the ball directly into the court from out-of-bound so it touches or is touched by another player (inbounds or out-of-bounds) on the court before going out of bounds untouched.
ART.3...Pass the ball so it is touched by a teammate while the ball is on the out-of-bounds side of the throw-in boundary-line plane.
ART.4...Consume five seconds from the time the throw-in starts until the ball is released on a pass directly into the court.
ART.5...Carry the ball onto the court.
ART.6...Touch the ball in the court before it touches or is touched by another player.
ART.7...Throw the ball so it enters the basket before it touches or is touched by another player.
ART.8...Throw the ball so it lodges between the backboard and ring or comes to rest on the flange before it touches or is touched by another player.
No player shall:
ART.9...Replace the thrower after the ball is at the thrower's disposal.
ART.10...Be out of bounds when he/she touches or is touched by the ball after it has been released on a throw-in pass.
Furthermore:
ART.11...The opponent(s) of the thrower shall not have any part of his/her person through the inbounds side of the throw-in boundary-line plane until the ball has been released on a throw-in pass.
NOTE: The thrower may penetrate the plane provided he/she does not touch the inbounds area before the ball is released on the throw-in pass. The opponent in this situation legally touch or grasp the ball. See penalty.
ART.12...No teammate of the thrower shall be out of bounds after a designated-spot throw-in begins.
PENALTY: (Section 2) The ball becomes dead when the violation or technical foul occurs. Following a violation, the ball is awarded to the opponents for a throw-in at the out-of-bounds spot nearest the violation.
(ARTICLE 11 only)
1. The first violation of the throw-in boundary-line plane by an opponent(s) of the thrower shall result in a team warning for delay being given (one warning per team per game). The warning does not result in the loss of the opportunity to move along the end line when and if applicable.
2. The second or additional violations will result in a technical foul assessed to the offending team. See 10-1-10 Penalty.
3. If an opponent(s) of the thrower reaches through the throw-in boundary-line plane and touches or disloges the ball, a technical foul shall be charged to the offender. No warning for delay required. See 10-3-12 Penalty.
4. If an opponent(s) of the thrower reaches through the throw-in boundary-line plane and fouls the thrower, an intentional personal foul shall be charged to the offender. No warning for delay required.