In what ways has the screening of checked baggage changed since 9/11?

In what ways has the screening of checked baggage changed since 9/11?

On September 11th, 2001, less than 5% of all checked bags were screened using explosive detection technology. Today, 100% of bags are screened for explosives. So it's changed significantly in the fact that now we use electronic explosive detection systems to screen all bags. And at the same time, we've trained employees of the TSA to do the screening. So the screening on September 11th compared to the screening today is significantly different.