Call me crazy, but, I've done it. When they are searching your bags, they are looking for weapons/bombs not drug prescriptions.
I know they have found my stuff before because they leave a note when they search your baggage and mine was in plain view along with 30 syringes and other assorted stuff.
This does not mean they won't arrest you, or turn you in it just means they have not given me any grief so far.
I think in the future I will go to a doctor friend and get him to write me a script for test replacement therapy and just carry the script and make my own labels for each vial just to be safe.