My friend was doing a pre-employment drug screening today. He hadn't been smoking much lately, about 1 joint a month for a while and the last time he smoked was about 2 weeks ago. He took a home test this morning and the line was very very very faint. I heard even a faint line is negative. He drank lots of water all day long until his pee was clear and took another test in the afternoon and the line was more solid indicating he was negative. I gave him some B vitamins to take to make his pee yellow but that was only about 45 minutes before the test. After the test he told me they put it in a vial and sent it off without giving him any results. Every time I have taken a pre-employment test (always been negative) they told me the results right away. What does this mean that they sent it off in a vial? Do you think they suspected dilution and sent it for further testing? Is there any way he can find out the results?