I am very new to using draw reins. My trainer has briefly introduced them in the retraining of my TB. We use them with a halter, and never through the bit. The reason is that I have trouble knowing when to give to him and when not to. He escapes to much from the contact. Keep in mind that my horse raced for a few years and then spent the next several years with his nose as high as he could get it, being completely introverted. At 22yrs old now, we are retraining him to do basic dressage. He'd never even been asked to come round to contact once in his life previously.
We only use the draws when I'm really riding crappily and can't catch him from getting his nose to high fast enough. I've seen some really detrimental use of draw reins before, and it kind of scares me. I know I can't really hurt him with the draws through the sides of the halter as long as I keep him moving honestly forward and give to him when he comes down. It still worries me though, so I thought it would be a good idea to post on here and see what are the best ways to effectively use a draw rein. I'd love to here what everyone thinks about using draw reins. :)