We've carried on trekking poles, as long as they were folded up and inside a small carry-on suitcase. Not a problem.

But please bear in mind that TSA not only changes its guidelines regularly, they also give complete and total license to TSA staff at the security checkpoint to make their own determinations about anything that is a little bit out of the ordinary. I've seen the line held up for 30 minutes to explore an electric toothbrush....and I've carried through a stone knife made of flint with only a cursory discussion with the security guard.
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Check our our website: http://www.backpackthesierra.com/

Or just read a good mystery novel set in the Sierra; https://www.amazon.com/Danger-Falling-Rocks-Paul-Wagner/dp/0984884963