Interesting night in NBA refereeing (Video)

[Nevadaref]

You will find that different mechanics are expected or appropriate at various levels of play and locations. They vary from state to state or even association to association within a state at the NFHS level and for NCAA the conference supervisors dictate everything.
Things change again at the NBA level. Others who are better versed in the current NBA directives will be along shortly to fill you in and you may well find that what Mauer did is perfectly fine.
For example, perhaps your instruction so far applies to 2-man officiating. I can tell you that both HS and NCAA have the Lead official inside the thrower (official is closer to the basket) on most endline throw-ins in the front court in the 3-person system.

[kstiles99]

I just hurt everyones feelings

[johnny d]

Originally Posted by Nevadaref

I can tell you that both HS and NCAA have the Lead official inside the thrower (official is closer to the basket) on most endline throw-ins in the front court in the 3-person system.

This is not true for NCAA-M. As was already pointed out, the L is on the outside for all throw ins that are between the lane line and the midpoint between the lane line and the three point line. Most throw ins occur in this space and therefore, most of the time the L is on the outside. The only time the L is on the inside is when the throw in occurs past this midpoint. You should take some of your own advice and not make declarative statements, especially when they are incorrect.

[Rich]

Originally Posted by Nevadaref

I can tell you that both HS and NCAA have the Lead official inside the thrower (official is closer to the basket) on most endline throw-ins in the front court in the 3-person system.

Not true. The current NFHS manual allows the lead to choose whether to be inside or outside on all frontcourt endline throw-ins that he administers.

I do choose to go inside, however, when the ball is inbounded a good distance from the lane line -- otherwise I'm of no use if that ball is quickly thrown inside.