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Undercover investigators were able to smuggle mock knives, guns and explosives through airport checkpoints earlier this year, and succeeded far more often than they failed.

TSA announced last month that all flights arriving to the U.S. would be subjected to new security screening procedures, with American citizens as well as foreigners possibly facing interviews by airline employees.

An undercover operation has revealed that Transportation Security Administration screenings at airports fail for the most part.

Undercover tests conducted by the Department of Homeland Security revealed "vulnerabilities" at security checkpoints across United States airports.

The Department of Homeland Security has since offered eight recommendations to improve checkpoint security.

The report on covert testing by the Office of Inspector General was delivered Tuesday, Nov. 7, in a classified briefing before the House Committee on Homeland Security. The exact number of TSA failings is not entirely known as it was made in closed session; CBS reports it as more than 70 percent while ABC says that 80 percent is in the right ballpark.

Watch a report about the new findings below.

Undercover operatives from the Department of Homeland Security's Office of Inspector General (OIG) were able to smuggle contraband through US airports at a high rate, according to a new report shared with a Congressional committee.

Pekoske said that "to invest in the CT technology requires funding above what TSA now has", but the agency wasn't on the path to CT development at checkpoints when the budget was developed, so the program wasn't reviewed for investment.

TSA officials said in a statement that the agency "concurs with the DHS OIG findings and is committed to aggressively implementing the recommendations". "We are focused on staying ahead of a dynamic threat to aviation with continued investment in the workforce, enhanced procedures and new technologies".

Congress and the TSA both supported installing CT scanners in place of outdated checkpoint scanners, but current funding doesn't allow that step to be taken, TSA administrator David Pekoske told Congress, CBS reported.