sorry for you, but infrequent users will not clean up as quickly as frequent users.. one pipe hit will probably not stick around too long, but to be safe...

the best thing you can do is work out more than you normally do, eat more calories than you normally do, and don't work out for the last couple days before the test.. should there be any lingering metabolites by then, stopping working out the last couple days will make your body store fat, basically it 'buries' metabolites in new fat, blocking them from being flushed and therefore detected