Make certain only the rodents are getting the bait.   A coon or other varmint can eat lots of bait and not die.    Also,  get a hold of one bite and dead bait.    Get on a program that rotates 3 different baits.   We use:  Hawk,  Jaguar and Rampage.    Rampage is the one bite and dead.   You can not buy Rampage at the local farm supply store.