They don't exactly have a great track record in that regard.
https://www.nbcnews.com/news/us-news/investigation-breaches-...
"In all, so-called "Red Teams" of Homeland Security agents posing as passengers were able get weapons past TSA agents in 67 out of 70 tests — a 95 percent failure rate, according to agency officials."
(Don't worry, though. They fixed it... by classifing the reports. https://www.cbsnews.com/news/noem-dhs-watchdog-feuding-over-...)