Good questsh!

Yeah, (if one's eyesight is good enough) is the answer. Sometimes the splits and cracks are so fine they can be hard to see; if it doubt, throw it out.

I clean the brass first, fired brass is filthy, and when clean it's easier to see issues. It takes a while, I normally do a few hundred at a time, inside at the kitchen table with coffee and snacks. Once I've filled up my clean brass container I'm good to go for some reloading. (I'm talking handgun rounds here.) With rifle, I do a hundred at a time and am super careful with them as the pressures are greater.