2oz is the what they usually ask for but if it makes you feel more comfortable then use the 4oz bottle. Most pre-employment UAs are not observed, but your consent paper isn't so reassuring. I would follow the dilution method the morning of the test and take your substitute with you as well. If they stand over your shoulder then you atleast have a chance with dilution. Make sure you practice with your sub temperature and keep it around 96-98 degrees.
Deige Reviewed by Deige on . Substitution Container size? I've been browzing for some time, but have read a few different quantities. I have an ideal container that is 4oz., but I have read that I will need from 2 to 6oz. What is the norm? BTW: This will be a pre-employment screening for an insurance company. While I am not a regular smoker, this interview came out of nowhere and I enjoyed a few too many tokes a couple days ago, and from what I have heard, they will definitely deny a diluted sample at the facility. Rating: 5