Clock Start on Free Throw?

[RookieDude]

We had a good discussion last night at our Association meeting.
A question came up about when to start the clock after a free throw.
Some of the Veterans said to "chop" it in when the ball hits the floor...(When the free throw ends) Some of the "Rookies" said that per the Rule book it is the same as a throw-in, wait untill the ball touches or is touched by a player on the floor.
We read the exact wording from the rule book but had different interpretations.
When does the clock start after a free throw?

RD
(I'm with the Rookies...start it when the ball touches or is touched by a player on the floor.)