Not Good

So I got a drug test for a temp agency at 2 today and I know I'm gonna fail. I got no time to work on a sub or anything. Should I explain I'm a good hard worker and I just like to smoke pot every now and then or should I piss and fail then try to explain? I kinda want to confess before I piss because if there is no way to get a job if I fail then I'm not gonna pay the 15 for the test. Anyone got any any ideas for my problem??

Just tell them that you was at a party and smoked some. Ask if they will give you a chance to get it out of your system and take the test... Tell them the party was about 2 weeks and it should be gone in a few days.... Now you have time to sub.... Good luck...