I inspect cases. If something does not seem right then I use a pair of pliers to bend the brass so that it is not able to be used again. I then put it into my recycle bucket.
Step one look for obvious signs of bad brass. Splits, separation rings, badly bloated cases, ect. ect.
Step 2 For bottle necked cases, and .30 Carbine. I paper clip test for seperation by using a bent paper clip inside. If a case has a cut in it the paper clip will catch. I crush those, and into the recycle bucket they go.
Step 3 Size. Then measure.
Step 4 Trim if needed.
Step 5 Prime. If the primers feel like they are seating too easy then I remove the primer, and scrap the case.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.