The 2010-2011 BCAPL definition of "ball in hand" includes: "The cue ball remains "in hand" from the moment it is picked up until the next stroke is taken."
The problem is that "the next stroke is taken" is vague, and either main interpretation is probably not what is intended.
If it means when the stroke is complete, that means ball in hand extends until the end of the follow-through after cue ball contact (see definition of "stroke"). This is clearly not what is intended.
If it means the beginning of the stroke: a stroke starts with the forward movement of the cue (see definition of "stroke"). I think that a player expects to be able to begin a stroke, stop before cue tip contact with cue ball, and still have ball in hand. I would be surprised if the BCAPL, and players in general, felt otherwise.
More precise and better matching player expectations would be:
"The cue ball remains "in hand" from the moment it is picked up until the next shot begins."
Changing from "next stroke is taken" to "next shot begins" makes it precisely clear the player has ball in hand until, and not past, the moment of cue tip contact with cue ball, under the definition of "shot".
There are also problems with "it is picked up", but I haven't thought it through yet. For example, picked up by whom? Often the player who fouls moves the ball to acknowledge the incoming player has BIH. And "picked up" is too limiting - sometimes the CB is rolled to a new position - this should be OK. The definition should allow more general ways of moving the CB to a new location, and distinguish between who is doing the moving.
The problem is that "the next stroke is taken" is vague, and either main interpretation is probably not what is intended.
If it means when the stroke is complete, that means ball in hand extends until the end of the follow-through after cue ball contact (see definition of "stroke"). This is clearly not what is intended.
If it means the beginning of the stroke: a stroke starts with the forward movement of the cue (see definition of "stroke"). I think that a player expects to be able to begin a stroke, stop before cue tip contact with cue ball, and still have ball in hand. I would be surprised if the BCAPL, and players in general, felt otherwise.
More precise and better matching player expectations would be:
"The cue ball remains "in hand" from the moment it is picked up until the next shot begins."
Changing from "next stroke is taken" to "next shot begins" makes it precisely clear the player has ball in hand until, and not past, the moment of cue tip contact with cue ball, under the definition of "shot".
There are also problems with "it is picked up", but I haven't thought it through yet. For example, picked up by whom? Often the player who fouls moves the ball to acknowledge the incoming player has BIH. And "picked up" is too limiting - sometimes the CB is rolled to a new position - this should be OK. The definition should allow more general ways of moving the CB to a new location, and distinguish between who is doing the moving.