You can use them however you want - you have my permission. Just keep in mind that their slim profile allows them to pass through weeds better.
...According to someone else from California:
"One of the most effective presenations for plastic worms is the slip shot rig. This is a variation of the split shot and Carolina rigs, developed for spininng tackle. The components are 1/8 ounce mojo slip sinker, size 1 Gamakatsu rubber worm hook or equal, small round split shot or plastic Carolina keeper and 4 1/2 to 6" plastic worms. This rig is fished with a medium/hvy fast action 6'6" spinning rod and 8 lb fluorocarbon line. Shimano Sedona front drag is a good basic reel. The same outfit works well for drop shotting. The weight is placed 18 to 36 inches up the main line above the hook. Use a Palomar knot or braid knot to tie fluorocarbon. The worm is hooked weedless Texas style. Set your reel drag at 2 to 3 lbs.To keep the sliding weight in place add a small split shot or keeper. A glass bead with a rubber strand makes a good stopper, or purchase a Carolina keeper. To fish this rig cast parrallel to the depth your are targeting (3 to 30') or slightly up and/or down hill. Simply drag the weight along the bottom or drift and let the boat drag the weight along very slowly. Set the hook when you feel slight pressure with taps by sweeping the rod back and reeling."
...According to someone else from California:
"One of the most effective presenations for plastic worms is the slip shot rig. This is a variation of the split shot and Carolina rigs, developed for spininng tackle. The components are 1/8 ounce mojo slip sinker, size 1 Gamakatsu rubber worm hook or equal, small round split shot or plastic Carolina keeper and 4 1/2 to 6" plastic worms. This rig is fished with a medium/hvy fast action 6'6" spinning rod and 8 lb fluorocarbon line. Shimano Sedona front drag is a good basic reel. The same outfit works well for drop shotting. The weight is placed 18 to 36 inches up the main line above the hook. Use a Palomar knot or braid knot to tie fluorocarbon. The worm is hooked weedless Texas style. Set your reel drag at 2 to 3 lbs.To keep the sliding weight in place add a small split shot or keeper. A glass bead with a rubber strand makes a good stopper, or purchase a Carolina keeper. To fish this rig cast parrallel to the depth your are targeting (3 to 30') or slightly up and/or down hill. Simply drag the weight along the bottom or drift and let the boat drag the weight along very slowly. Set the hook when you feel slight pressure with taps by sweeping the rod back and reeling."