I got home from a business trip a couple years ago, unpacked my bags, and found the switchblade I'd lost a few months prior. I went through security twice with those bags...
Similar thing happened to me, I had 1/8 ounce weed in my hand bag I unknowingly packed, flew in from Los Angeles -> China -> India. I went through rigorous security checks with police dogs and fully body scanners at both LA and China. I panicked when I opened my bag when I reached home.
Hundreds of pistols fly every day in the US, with no major issues.
We could easily abolish the TSA with no major harm.