From IAABO Dec. 2011 Newsletter:

[APG]

Originally Posted by HawkeyeCubP

Is this play wrong, then? And why am I on the strugglebus about this tonight?

Play # 5: "A1 has the ball for an endline throw-in in his/her frontcourt. A1's pass to A2, who is standing near the division line, is high and deflects off A2's hand and goes into the backcourt. A2 is then the first to control the ball in A's backcourt. RULING: Legal. There is no violation sinxe ayer and team control had not been established in team A's backcourt becore the ball went into Team A's backcourt."

Here's how you need to view team control during throw-ins...it only affects fouls by the throw-in team...we handle EVERYTHING else the exact same.

In the play above, because player control had not been established first, there is no backcourt violation (as well as 3 second violations or 10 second violations).