I took a First Check at home drug test yesterday and the I'm not sure if the line came in that faintly or my eyes were playing tricks on me. I'm going to dilute anyway just in case sub won't work for whatever reason.

Will a 1.5 oz container prove to be enough urine? I had a 1.7 oz shampoo bottle I was planning on using, but the First Check Drug Test comes with an 1.5 oz vial for you to send your specimen away in. It's actually a better shape and I was thinking that would be better. Is 1.5 oz enough?

Last thing I want to do is successfully sub, then be told I need to produce more urine.