According to the rule book:
29. In marking tests, a dog whose handler gives him a line in the direction of the fall, provided that such lining is accomplished briskly and precisely, should not by reason of such lining be outscored by a dog not so lined. However, conspicuously intensive lining is undesirable and should be penalized.
Is the intent of this rule to penalize extensive (taking too much time) lining?
How do you decide when lining should be penalized?
How severe typically is the penalty?