I'm confused, I've always kept the oil that I use for deep frying. I have a container of oil that I use for frying potatoes and another container of oil I use to fry doughnuts. I strain and place in an air tight container and each time I use it I add a little more fresh oil to it.
About chicken fried oil, I've never kept it, always through it out for the reasons stated. However, don't you think that the temperature at which the oil has to be heated would kill any bacteria that was thriving in it?
Anyway OP, if you do throw your oil out make sure you do so safely. Don't pour it into the kitchen sink or any drain. I fill up either plastic bags or an old container and throw it with the garbage.