Never!

If your new to jigging the best thing to do is jig it a few times where on the up swing the jig is only a foot below the surface and then watch it drop out of sight. It's really very easy and it helps you get the hang of it. It is also good to know just how fishy looking it is.
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"Government does not solve problems; it subsidizes them." Ronald Reagan

"The trouble with Socialism is that you eventually run out of other people's money." Margaret Thatcher.

"How fortunate for governments that the people they administer don't think." Adolf Hitler