terry crosby went to work for the tsa almost from the beginning.gned up eight years ago because the attacks made him want to serve his country. he rotates through several different jobs during his shift, from running the x-ray machine for carry-on baggage... >> guy left his liquids in there. >> reporter: ....to hand- searching for suspect items... to physically searching passengers. >> okay, i'm going to go inside your collar. >> reporter: it's not his favorite job, but a job he says needs to be done. >> a lot of americans don't feel that they should be patted down, that it's not necessary to be patted down. but when you have things that come in that don't belong, or try to take things on the plane that don't belong, then it is necessary. >> reporter: some americans believe those "enhanced pat- downs," which started within the last year, violate their constitutional rights. they're just one part of a raging debate over how far the tsa should be allowed to go. since 9/11, security procedures have steadily escalated after a series of failed terrorist