This question is becoming more frequent due to the increased popularity of assist hooks, rather than trebles, on many types of lure. The IGFA rules permit the use of assist hooks, however, there are some specific requirements that must be met.
When using these hook rigs on any artificial lure other than a skirted lure, the connecting cord – termed the ‘lead’ – cannot be more than 1.5 times the hook’s length, and the bend of the hook may not be more than 4-inches (101mm) from the closest point of attachment on the lure. Double and treble hooks may not be used as assist hooks.
The reason for limiting the length of the lead is to prevent the potential foul-hooking of fish due to free-swinging hooks that extend farther beyond the lure.