Pour a little of the sauce on the bottom of the slow cooker.
Put the drumsticks in the slow cooker. Lay them flat as possible, although you'll definitely need to do 2 layers of chicken.
Dump the rest of the sauce on top of the chicken.
Cook for 4-6 hours on low. Remove the drumsticks from the slow cooker.
(Optional) Can brush more sauce on top of the chicken. If desired, place on a roasting pan and bake on 400 degrees for 5-10 minutes to "sear" in the sauce.