I have one adult female T. s. concinnus (Red-spotted garter snake) that has decided worms are not good to eat. She would rather have fish or pinkies. This attitude created a problem as worm are on the menu and she needed to eat.
She was more then willing to down the few chunks of salmon I had left but those were destined for some other snakes.
I decided to try a little sleight-of-hand with her.
I had a piece of salmon in one hand and a large night crawler in the other. With both food items very close together I placed the piece of salmon under her noise. Watching her closely I switched to the worm as she made her strike. To be honest I don't think she new the difference. With the smell of the salmon over powering the worm smell she thought she was eating salmon. After 4 large crawlers went into her belly I knew the system worked. I did try to offer worms alone but she refused to take them. Switching to offering the salmon first did the trick.