In what ways has the screening of carry-on baggage changed since 9/11?

In what ways has the screening of carry-on baggage changed since 9/11?

The way we screen carry-on baggage today is similar to what was done on September 11th. However, the list of items that passengers are no longer allowed to bring onto an airplane have changed significantly. The training that we have given to our new employees that were brought on when the TSA was created is significantly different. They are able to see and identify many different images in the carry-on bags than they were able to do on September 11th.