Recently several people have gotten through with guns (multiple airports), stun guns, mace, knives. Most, if not all of those items should have been easily identified, and they were not. Your lead bag looked like a square probably, and since it wasn't a disposable razor, or nail clippers, they were not trained to care.

I do believe random checks are good, and I do believe the new standards are good, but as you clearly show, there isn't a standard. What is good today wasn't yesterday. There will never be a perfect answer, but there has to be consistancy.