Tetanus vac = fail drug test for thc ???

hello I currently was fired from my job after testing positive for Thc - Marijuana
I dont use drugs in any fashion so this posed as sort of a dramatic insodent
I did happen to have a tetanus vac aprox 15 hours  before hand after cutting my finger.
so i did some research and found that in some cases tetanus vacs have shown as false positives.

is there any one who can tell me if this vac could cause a false positive and where do i get the information to print off about it to take in to my work.

I am curently not taking any perscription drugs.

I am 21 years old and live a very active and healty life style. (adult vacination)

the only thing i can think of would be the vacination

here is the name of the  vac if you could provide me as much information as posible i would be much abliged

Diphtheria/Tetanus Toxoid Injectable ((orederd asDT Toxiod)) 0.5 ml intramuscular.

So if any one could please tell me if this is the case I would really be thankfull.

[knowlege]

well didnt take long for me to figure this out i have been contacted and it has been verified that that can definitly cause a false positive  

Well for anyone who reads this I have found my answer and thankyou for your time


sinserily RJ