Potty training.... HELP!!!

I think I'm gonna lose my mind!!! My son just turned 3 last month, he has been potty trained since before he was 2.5. Except for the fact that he will not stop pooping his pants, this child refuses to poop in the toilet. I'm out of ideas and patience. I'm tired of throwing away 10 pairs of underwear a week. Anybody have any suggestions, anything that worked for your kids? I've tried potty charts, bribing with candy... everything.