My brother has been fishing with a BPS blade baitcaster and using a Texas Rigged worm. The worm is twisting the line until it forms long twist. How can he keep this from happening?

Typically line twist when fishing a worm (in my experience at least) is a symptom of a poorly rigged worm. First I'd make sure the hook is centered up and nicely rigged.

 

There's also the possibility that the line has retained some twist from some other use prior to the worm. If you've got a boat you can remedy this by removing the lure and just peeling line out behind the boat as you use the trolling motor to move away from it (letting it trail behind). This allows all the twist to work itself out. Then just reel everything back up with tension on the line.

 

You can do this at home as well by attaching your line with a swivel to a tree, walking away from it slowly with some tension on the line and checking every 5-10 feet to see if the twist is out by putting some slack in the line.

 

Hope this helps!

If he retrieves the worm spins. It could be improperly rigged though.

I run into that problem occasionally . Its the worm not being completely straight. If you're texposing, it  cant be done with just any hook. Some hooks have to be buried in the worm to keep it straight or it will be kinked and will cause twist. 

I run into that problem occasionally . Its the worm not being completely straight. If you're texposing, it  cant be done with just any hook. Some hooks have to be buried in the worm to keep it straight or it will be kinked and will cause twist. 

What kind of hooks are needed?

a good quality barrel swivel helps, but so does the Gamakatsu worm hooks that have the bait keeper barbs on the hook and they are perfectly straight, designed for the exact application of using a bait that causes worm twisting etc...Sometimes you also have to let you line out every dozen casts or so and let it all out and reel it back in with tension...I find if I am doing a lot of twitching and changing speeds and directions with any bait or lure I get twitsting which causes the bait to roll...If a swivel is not an option, try to use your reel for action instead of your rod tip...Some reels are also better than others for even line lay.

It twist when he reels the worst. Probably not hooked straight. I'll check those hooks out.

DO NOT EVER use Tru Turn hooks. I learned this after one purchase.I read recently that most of that twist is happening when your worm is out of the strike zone and you reel up fast, which makes good sense. But, yeah, as mentioned here, the worm needs to be aligned as closely as possible. It could also be that you're using a hook a size or two too small and if it were larger, its weight would cause the worm to not flip.

DO NOT EVER use Tru Turn hooks. I learned this after one purchase.I read recently that most of that twist is happening when your worm is out of the strike zone and you reel up fast, which makes good sense. But, yeah, as mentioned here, the worm needs to be aligned as closely as possible. It could also be that you're using a hook a size or two too small and if it were larger, its weight would cause the worm to not flip.

He uses one hook size somewhere in the middle so that could be it also.

DO NOT EVER use Tru Turn hooks. I learned this after one purchase.I read recently that most of that twist is happening when your worm is out of the strike zone and you reel up fast, which makes good sense. But, yeah, as mentioned here, the worm needs to be aligned as closely as possible. It could also be that you're using a hook a size or two too small and if it were larger, its weight would cause the worm to not flip.

Those eagle claw 45 autos caused a lot of line twist too. 

Those eagle claw 45 autos caused a lot of line twist too. 

He is using Eagle Claw, but I do not know what series.