OK, here is the ruling from the USBC, with the original e-mail to them attached:
This is in response to your e-mail below.
In instances where a bowler releases the ball on an adjacent lane, it is a legal delivery. The ball left the bowler’s possession and crossed the foul line into playing territory (Rule 4a). The delivery counts and the bowler receives zero.
Bowling on the wrong lane is when a bowler executes the delivery from the wrong lane.
Feel free to contact us should you have additional questions regarding this matter.
Sincerely,
Kathy Andersen
Senior Rules Counselor
Bowl with US
Visit the USBC official website
www.bowl.com and click Rules for the most recent copy of the USBC Playing Rules and other helpful publications and resources.
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This happened in our league tonight.
Bowler up on the left lane falls during his approach and releases the
ball, which rolls over to the right lane and falls into gutter and rolls
to the pit. The bowler did not foul, he wound up well short of the foul
line.
We decided it was a dead ball due to the fact that he "bowled" on the
wrong lane.
Correct interpretation?
Thank you very much.
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RW (THB)