Contacting a thrown ball during a throw in
 

A1 is the thrower during a throw-in. A1 releases the ball at an angle towards the court to a teammate. B1 reaches through the OOB plane and hits the ball.

If A2 touches the ball when the thrown ball is on the OOB side then it is a violation (9-2-3).

Is this same play covered for Team B in the rules or is it legal?

1) No violation on B1 (9-2-11). The opponent may break the plane of the boundary line after the ball has been released.

2) Depends on whether it is a designated spot throw-in or not. (7-5-7)

3) Huh??

But can he contact the ball.

Yep

I was basically trying to summarize the question.

1. yes, he can contact the ball once it's been released.

Is this only when the ball is being thrown onto the court. What if A1 passes it to A2 on the endline after a made basket and B1 grabs the ball.

In that situation, it would be a violation!

No, it would be a T. (A1 passing to an OOB A2 along the endline after a made basket when B1 touches the ball).