TSA is not reliable on their allowances.....
First of all, they don't hold your items, they get thrown in a bin and disposed of, no chance of retrieval.
The first time I traveled with my featherweight, they made me take out the needle. Really????
Don't do what I did: I started laughing and told them I could kill them quicker with the pen in my purse. Needless to say, my purse was then searched. I thought it was funny....no sense of humor those TSA people.