Opinions on a drop shot rig for salmon

[Giuga10]

I have a question about Salmon fishing also.

I heard that when Salmon are running the do not bite at any bait because there purpose is to lay there eggs and die. The person then said that the only way to catch Salmon when they are running is to put a jig or worm on and just drop it in the water and if a Salmon feels intimidated or at risk it will ram into the lure and snag itself and that's how you hook a Salmon.

Is this true or do Salmon bite during the run.

Thanks,
Giuga10