I don't fly often---so I have not met many TSA personnel in their at-work mode. The ones I have met, however, matched fairly much what I expected from the requirements for the job, which, taken from the TSA hiring website:
* Have reached his/her 18th birthday at the time of application submission;
* Have a high school diploma, GED or equivalent; OR
* Have at least one year of full-time work experience in security
work, aviation screener work, or X-ray technician work.
--So, 18 and maybe have graduated from high school, but it isn't necessary if you've worked enough "security" for local gigs. Obviously these are the bare minimums---but it really isn't like they have high standards.
The training time maximums listed on the hiring site include a whole 9 days (max) of training, plus an additional 16 days (max) of on-the-job training. (Information from
http://jobview.usajobs.gov/GetJob.aspx?JobID=93749614&JobTitle=Transportation+Security+Officer+%28TSO%29&q=screener&sort=rv%2c-dtex&cn=&rad_units=miles&brd=3876&pp=50&jbf574=HSBC&vw=b&re=3&FedEmp=N&FedPub=Y&caller=basic.aspx&ss=0&pg=1&AVSDM=2010-11-17+12%3a31%3a00 )
There are a number of professional, educated, and well-trained people working for the TSA. However, unsurprisingly, with requirements as they are listed, I do not expect that percentage to be high. For anyone who works for the TSA, please don't take this as a personal reference---I am merely stating that from a statistical standpoint, most of the TSA screeners are NOT going to be professional, educated, nor well-trained.
As someone who worked security and in corrections for a number of years, I've seen all too many times what happens when young, uneducated people suddenly are given some authority, when they haven't been trained enough in its use---and when they've never had any before. Results are not good---and "professional behavior" is not what happens.