Let me tell you a little story that actually happened.
We had a nurse (RN) who was always volunteering to "help" other nurses give PRNs and was a "whiz" at IVs.
Wow we said, she sure has energy. What a gal!
Well to make a long story short, she was "helping" herself to at least half of every tubex/syringe of Meperidine or Morphine she gave. She kept 2 multiuse normal saline 10cc vials in her pockets.....of course......one for morphine, one for meperidine.
She was finally caught when a little old lady (who wasn't senile) went to the VP for nursing and filed a complaint that she had not gotten relief from an injection.
She was caught with 17 Tylox, 10 tubexes of morphine and her 2 vials in her uniform
pockets!! What if she had laid one down and someone irrigated with the "saline" thought to be in it?
Since that time, if I have not opened the vial myself I refuse to use it.
And if I use it I throw away the rest. Case settled.
Price be darned....I am not going to give ANYthing that could be contaminated with ANYthing.