unsuitable for CIA...after passing poly/med/psych

[wishingforanswers]

i recently received the "unsuitable for Agency employment" letter and am still completely shocked as to why and for what.  i received the about three weeks after i completed my 3 days of testing, which from what i was told went really well, so as you can imagine i am completely devastated by hearing this news.  i have no drug history or criminal history, and disclosed all of the little things i did when when was younger (17-21) during the poly (i took a sign and a glass from a restaurant once).  Everything else seemed to be fine, and i even saw that  they checked my credit history, which is excellent at 747.  I get the letter three days later, and it's dated the same date they checked my credit.

any ideas what went wrong and why???  i honestly have no idea, and keep going over and over again on what i may have said that resulted in this and can't think of anything that would deem me unsuitable.

i hope its a mistake, and will try and contact to find out, but chances are its not and it is irreversible.  and ideas are appreciated. :-/