WHILE DESCENDING A LADDER TAKING THE NEXT STEP DOWN HIS PLANTED FOOT SLIPPED CAUSING HIM TO FALL W/ALL HIS WEIGHT ON 1 ARM. HIS FEET WERE MUDDY CONTRIBUTING TO THE CONDITION. THIS CAUSED PAIN IN HIS R/SHOULDER. HE DIDN'T REPORT THE INCIDENTUNTIL 3/26/02 AT WHICH TIME HE WAS PLACED ON LIGHT DUTY.